Left 4 Dead/YMMV

"Bill: Francis, you beautiful sonuvabitch, you did it!"
 * Abridged Arena Array: No Mercy was the only campaign people would ever play on VS, ignoring Blood Harvest completely. Even after Death Toll and Dead Air were released for VS mode in the Survival Pack DLC, people still chose No Mercy. The sequel had the same problem where people would only play Dead Center and sometimes The Parish. Even after The Passing and The Sacrifice was made, Dead Center was still the only campaign people played for VS mode. Until No Mercy was ported to the sequel, then everybody flocked to it.
 * Alternative Character Interpretation:
 * The Church Guy. Some tend to see him as The Scrappy of the game, while others go in the opposite direction, making him an Ensemble Darkhorse instead.
 * There's more than just a few hints that Ellis's chipper personality and Cloudcuckoolander tendencies are signs that he's become completely unhinged by the zombie apocalypse, and is spending the game in what's essentially one long psychotic episode.
 * And some see Louis as either a guy whose positive reactions is the opposite of how he feels and it is his way to cope without snapping while others feel Louis is just trying to find hope in a grim situation.
 * And the Fandom Rejoiced:
 * Valve announced that the Left 4 Dead DLC, The Sacrifice, will also be available to people who own Left 4 Dead 2 because Valve believed that making the campaign only available to people who only own the first game is a stupid idea. On top of this, people who own the sequel will also get an official port of No Mercy, a Left 4 Dead 1 campaign, as a bonus! Info is here.
 * And then Valve confirmed Bill won't get the Fake Shemp treatment. His voice actor, who wasn't available while they were working on the previous DLC update (all of Bill's Crash Course dialogue is recycled from other campaigns), has recorded new lines for The Sacrifice.
 * Valve announced that they'll be releasing all the remaining Left 4 Dead 1 campaigns for 2, including an official fan-made map.
 * Also falls into Ruined FOREVER.
 * Breather Level: Although it's definitely not on your side, the AI director does tend to give you a breather in-between swarms of zombies or boss encounters, especially if you're just limping through. The period of time is increasingly brief on higher difficulties.
 * The elevator in No Mercy (only in campaign)
 * Cargo Ship: The first game has Louis and his peelz.
 * Cliché Storm: For zombie movies, played for laughs.
 * Crowning Moment of Awesome: Several achievements qualify, such as the 'Untouchables' achievement for making it through the finale unscathed or the 'Unbreakable' achievement for going an entire campaign without healing. The arguably most awesome, however, is the 'Man vs. Tank' for killing a tank single-handedly.
 * A bot cr0wning a witch. The lack of any emotion they display just makes it cooler.
 * Crowning Moment of Funny:
 * This is the sole purpose of soundpacks. Whether they succeed in this endeavour may vary.
 * The dedications in the Closing Credits.
 * Ragdoll Physics. Much potential amusement lies within those codes.
 * Draco in Leather Pants:
 * You will be amazed at the sheer amount of Self Fanservice art there is of the Hunter as a Bishounen. And let's not get started on Hunter/Smoker or Hunter/Witch...
 * The Witch, leading to her being The Woobie or even Ms. Fanservice. Which can be a very good thing, if you know what I mean.
 * The Hunter and Witch get this a lot. Even the Smoker at times. Why? No one knows. Who remembers the Hunter being a hoodie-wearing Bishonen, the Witch being a cute Emo Teen, or the Smoker being even remotely attractive in the game with all those cancerous tumors growing on him.
 * Ear Worm: The wailed tune that plays when you are getting too close to a Witch is extremely catchy.
 * Ensemble Darkhorse: NO ZOMBIE IS SAFE FROM CHICAGO TED.
 * Epileptic Trees:
 * Nothing about the origin of the Infected is explained, leaving players to come up with absolutely every theory under the sun. Even off-screen supporting cast within the game itself fall afoul of this trope as they bicker among themselves on the various wall scribblings, etc. What's impressive is that the emergent narrative nature of the game makes these somewhat more valid than usual.
 * It is mentioned in Kotaku interviews, game reviews and other non-in game sources that the zombies are infected with a mutated rabies virus that the playable survivors are immune to. That's why they don't get turned when they're exposed to the zombies bodily fluids.
 * Directly mentioned in the sequel in-game with the players' discussion of immunity and carriers.
 * Excuse Plot: It's basically "You wake up one day, everybody except you and 3 other misfits with eccentric personality quirks are zombies. Try not to get killed".
 * Fan Dumb: Hoo boy. While the fans were pretty much alright when Left 4 Dead first started, Left 4 Dead 2 opened a huge can of worms. Between people who think they know what it takes to improve either game or the series as a whole, flame wars over which L4D game is better, people demanding Valve to fix everything right this instant, people demanding Valve to add more content, demands for Valve to make their favorite mutation a permanent game mode, and people who tell everyone else to shut up since Valve has done no wrong, it's hard to find people who actually play the game and not complain about something in the Left 4 Dead series.
 * Despite people who swear Left 4 Dead 2 is the worst game Valve ever made and them complaining about anything in the game on the Steam forums time and time again, these type of people either just never leave or are seen still playing the game.
 * Not to mention, when Left 4 Dead 2 was announced, there was a "Boycott" of the game. Considering most people who were in the Boycott STEAM-group bought the game at launch...wasn't very successful, was it?
 * Follow the Leader: High Voltage Software's The Grinder looked to several people like "Left 4 Dead Wii" upon its first announcement. It's still an FPS on the Wii, but the Xbox 360 and Play Station 3 versions have changed formats to a top-down shooter, making it more like a Spiritual Successor for High Voltage's own Hunter: The Reckoning.
 * Game Breaker:
 * A major problem in the first game. Corner camping. Have all survivors cram up in a corner of a wall or a small room and constantly melee the infected rushing in or shoot all at once. Aside from a Tank, nothing can break through this formation. This is so common that most infected players in VS mode wait it out until the survivor players move again and both teams will corner camp when it's their turn as survivors.
 * Game Mod: A soundpack one that changes all the sounds of the infected to Macho Man Randy Savage quotes. Hilarity Ensues.
 * Becomes something of a Funny Aneurysm Moment following his death...
 * There's also a Tourette's Guy soundpack for the Tank. Watch it here.
 * And there's another that replaces all playable infected with the survivors, amusingly.
 * On top of that, one can also replace the Tank's sounds with those of the Heavy from Team Fortress 2. Hilarity ensues as the Tank taunts the survivors ("Who send all these babies to fight?!") berates the team for killing it ("Little, little man!"), runs around grunting and talking to its 'Sandvich', loudly exclaims that it is on fire when it is indeed on fire, and even calls for a medic when taking lots of damage from survivors. Sadly, the sound pack was pulled from some sites and cannot be found easily.
 * Fortunately, players can still find the Heavy in the Left 4 Dead universe, along with a certain friend!
 * Scout zombies, that is all.
 * Some people have gone so far to change the Tank's music as well, like turning it into "Can Can", Benny Hill, and even Final Destination!
 * Also, Johnny Bravo Tank.
 * Billy Mays Tank.
 * YEAAAH!
 * Pee-Wee Herman Infected. Can you say nightmare fuel?
 * If you think all the sound swapping is hilarious, try playing servers that allow up to eight survivors in the game. That's right, you'll have multiples of the same characters running around and you will go WTF when you see messages like "Zoey saved Zoey." Even Expert becomes a bit easier with 8 people's worth of firepower running around.
 * It Got Worse in L4D2, as servers in that game often allow more than eight survivors, plus a skin-switching utility that allows players to use Special Infected models while still playing as Survivors.
 * Teletubbies. Now you can be as afraid of them as Jerry Falwell.
 * Another good case of nightmare fuel, watching empty-eyed Teletubbies running at you and trying to rip you apart.
 * This game + soundtrack from 28 Days/Weeks = Pure terror.
 * o hai!
 * Left 4 Dead 2 had demo mods! Such mods include Don't Stop Me Now as a Jukebox song.
 * Beavis as the Jockey.
 * Possibly the greatest mod ever
 * Shut up Witch.
 * Here are some hilarious soundpack mods. You can thank me later.
 * Not enough soundtrack dissonance for ya?
 * For those who need more Moe in their zombie-killing, there is a K-On! mod for 2 where the survivors are replaced with Yui, Ritsu, Mugi, and Mio (Azusa replaces Zoey in "No Mercy" and "The Passing"). Note that the mod only replaces the skins - the voices aren't changed (though there is an effort to rectify that). Separately, the pre-recorded Midnight Riders concert can be replaced with several songs by Hokago Tea Time (nothing like killing zombies to sugary J-Pop).
 * More moe can be had with the Lucky Star cast.
 * Demonic diaper-wearing Justin Bieber Witch.
 * Germans Love David Hasselhoff:
 * The game is apparently fairly popular in Japan, possibly owing to the game's linear structure and immense replay value, which is surprising considering how unpopular western-developed games, specifically first-person shooters, are in Japan. Even Hideo Kojima has confessed that he's a fan of the game!
 * It's also very popular in Russia and other parts of Europe.
 * Goddamned Bats:
 * The common infected, who all have the ability to slow you down just by hitting you.
 * Especially if there's a Tank; the common ones will not let you move out of the way.
 * Not at all helped by their uncanny ability to flank you and pinch you between four or five others.
 * Good Bad Bugs:
 * The game is almost filled with various glitches and exploits that make the campaigns almost laughably easy but can be a life saver on Expert difficulty. Most of these were patched for VS and Survival modes to keep the balance.
 * Hell Is That Noise: The Witch's sobs are very unnerving if you don't know where she is, or if you're about to piss her off.
 * Hilarious in Hindsight:
 * Francis can see some birds in "Crash Course" and say "I hate birds," to which Zoey replies "Yeah, birds are dicks!" Later, in "Blood Harvest", the group startle a murder of crows, who in turn start a horde. And they do it again in "The Sacrifice".
 * The Fictional Video Game in Stay Alive is a co-op monster/zombie shooter set in New Orleans. Compare to Left 4 Dead 2.
 * Ho Yay Shipping: The Sacrifice brings us an, uh...interesting line that Bill can say if Francis is the one to make the Heroic Sacrifice...

"Bill: Francis, is there anything you don't hate? Francis: You know what I don't hate? I don't hate vests."
 * Internet Backdraft: May the internet have mercy on your soul if you dare say that VS mode (mostly in Left 4 Dead 2) is fine just the way it is. Expect to have competitive players to either call you a casual player or assume you never touched VS mode at all.
 * The community will also explode if you even try to compare the first game with the second game or have the balls to say one is better than the other.
 * Jerkass Woobie - The Church Guy. Justified in that he is halfway turned into a zombie when you meet him, and distrusts you because he had been bitten by the previous person he let in.
 * Memetic Badass:
 * A number of forums have taken a single graffito referencing a "Chicago Ted" (itself a Shout-Out to an old gaming website) and seem to be attempting to turn him into a Chuck Norris-esque zombie slayer.
 * Found in a community campaign, "I Hate Mountains" Area 4, is The Epic of Chicago Ted.
 * Memetic Mutation: Numerous.
 * "I hate hospitals." "I hate stairs." "I hate forests." "I hate small towns." "I hate lawyers." "I hate tunnels." "I hate vans." "I hate train yards." "I hate Ayn Rand."
 * In No Mercy, Bill may Lampshade this on the elevator:


 * And adding to the almost endless list is the fanmade campaign, Dead Before Dawn with, predictably, "I hate malls". Another custom campaign, Night Terror, adds "I hate the jungle."
 * Even parodied a bit in the trailer for the Passing campaign, in which Francis and Rochelle start to agree with hating everything, and for once, Rochelle hates something Francis doesn't, his vest.
 * "Grabbin' Peelz!"
 * PEELZ HERE!
 * If Pills are involved in a Gmod machinima, Louis becomes a Memetic Badass just to get them. But never try to take them away from him.
 * This has evolved into somewhat of a "What Happens When X Gets His/Her Pills" fad. Most notably, it has been applied to Dr. Gregory House.
 * RAGE QUIT! Though this is spewed over anyone leaving over for ANY reason, even if there is no raging involved. Some people are now also shouting RAGE KICK over people who are too kick happy in forcing people to leave.
 * 1. bind "vocalize use adrenaline" 2. Play as Ellis. 3. Press that key over and over. 4. ??? 5. WUBUBUBUBUBU
 * "I lurve horses."
 * "I love horses" and "Horses are for riding not eating."
 * ZOEY, ZOEY, ZOEY!
 * HOLY SHIT GUYS! KIDDIELAND!
 * "Coach looks like Uncle Phil!"
 * And loves Chocolate helicopters!
 * Actually, he IS A chocolate helicopter
 * ''ONE MAN CHEESEBURGER APOCALYPSE. '
 * He closed a door on me! That's a viable fucking weapon!
 * He used a meme on me! That's a viable fucking weapon!
 * "Karma Charger is always watching!"
 * Here, Let Dr. Nick patch you up.
 * AH, TITS!
 * Zoey has startled the Witch!
 * Nature has startled the Witch!
 * The Millstone: They show up a lot more than in most online games (or maybe the focus on teamwork just makes them a lot more obvious).
 * Mondegreen: IIIII'M ONE Batman! ONE BATMAN!
 * Moral Event Horizon:
 * And as of part three of The Sacrifice comic:
 * Most Annoying Sound:
 * Step 1: Bind a vocalization to its own key. Step 2: Press this key repeatedly. Step 3: BOOMER BOOMER BOO-BOOM-B-B-BOOMER

If done online, most players will be quite eager to kick you off the team. With bullets.
 * Valve quietly enforced a patch (meaning no mention of it was made in the update release notes) that disables binding vocalizations to a key press, which was probably done due to everyone shouting the trope name every time someone decided to spam the death scream for the entire game. There is still another way to use custom binds, but it's a very tedious and somewhat confusing task to do, plus people will still be happy to spam the default voice binds, mostly the "laugh" command. For some strange reason, this patch only applies to Left 4 Dead 2, but not the original.
 * Rochelle can be a source of these, ESPECIALLY when she's incapacitated or being attacked by a Jockey.
 * The Jockey's laugh might make some want to tear their ears out.
 * Player Preferred Pattern: Auto shotguns were the most used weapon in the first Left 4 Dead, due to its power and firing speed.
 * Clown Infected shoes must really annoy the horde (and players) to be able to draw in such large numbers of other infected.
 * Stop Having Fun Guy: A disturbing number of people will vote-kick you for not being as good as they are in Versus, moving at less than a dead run through a campaign, failing to cr0wn a witch, getting pounced on once without dead stopping the hunter, being incapacitated for any reason, shooting a boomer and splattering the team accidentally, or sometimes even for picking up the "wrong" weapon. Suffice to say there are SHFGs galore in Left 4 Dead.
 * Also, people who antagonize others for playing on "Easy," and ESPECIALLY people who do so for players on "Normal."
 * Of course, the majority of people you'll find playing on Easy are just going for achievements, god help you if you're actually at that skill-level.
 * VS mode is ripe full of these guys, mainly due to how competitive the mode can get. If you don't rush with the rest of the team, don't save someone in a nanosecond when a Hunter pounces them, let yourself catch on fire while playing as a Tank, even though you tried to avoid the attack, you're a Scrub to everyone else. It also does not help that the only way to learn how to play VS is to try everything out since the game barely teaches you how to play as the special infected.
 * Gets worse when you run into this type of player who judges other players purely on hours they invested into a game. If a player doesn't have X hours logged, they are deemed n00bs and are promptly booted from the game.
 * Now in full spades after Valve made a poll asking if all weapons (except ones in safe rooms) should be either single pick up or multi pick up and the majority voting for the latter. Cue in complaints from "pro" players about how the community is too stupid to know what they want or how Valve is catering to the casuals.
 * Tear Jerker:
 * Helm's Deep. Yes, someone made a level based on The Lord of the Rings, and yes, it is epic... but the wall blows at 4:00, and Theoden King only gives the order to fall back at 8:00, leaving you alone on the plain with limited choke points to hide behind and often two of each type of Special pouncing on your ass. If you don't get up the stairs with at least three players alive, you're probably doomed.
 * Too Cool to Live:
 * Unfortunate Implications: According to Chet Faliszek, the reason there are so many Witches near the sugar mill in Hard Rain is that they are drawn to the smell of the sugar. So we have female zombies, likely to snap at a moment's notice (ESPECIALLY if you touch her), who are drawn to the smell of sugar... yeah.
 * That explanation is a Sure Why Not the devteam cooked up because, by coincidence, large numbers of Witches tended to spawn around it. If you're going to whine about it, blame the coding.
 * The Woobie:
 * Zoey, after 2-3 rounds of Break the Cutie and all.
 * Arguably an Iron Woobie, since she's able to spring right back up and kill more zombies even after Bill's death.
 * The witch, anybody? Some people go on suicide missions just so she would stop crying. Others think she's just wangsty.