Diner Brawl

Woody Harrelson wanted his eggs sunny-side up.

A sub-trope of the Bar Brawl. Sometimes, you don't have to go to the Bad Guy Bar in order to have a beat down. Sometimes, all it takes is a trip to the local Greasy Spoon. One or more characters are trying to have a nice meal when an inexplicably aggressive diner patron decides to pick a fight. The inexplicably aggressive patron might even have one or more inexplicably aggressive friends backing him up. This will result in an altercation of some sort despite the character's best efforts to avoid a fight.

This scene might play out in more family friendly movies where a bar could be seen as inappropriate. Maybe the scene involves teenagers so a bar is certainly out of the question but the writers still want to invoke the same idea as a bar brawl. It's also possible that the writers simply wanted to move the action to a different locale in order to have a nice breath of fresh air. Unlike the Bar Brawl where the hero is usually guaranteed a winner, this scene might have a more unfortunate result. Sometimes, the scene is meant to show how meek the hero is before having his or her final moment of glory.

The Diner Brawl often ends with someone saying, "Check, Please!"

Occasionally the Porting Disaster of the Bar Brawl, when, after a night of drinking, the consumption of other substances and tension-building, the combatants-to-be have retired to a diner or restaurant for a meal...

Comic Books

The Invisibles. A local cowboy doesn't like the fact that Lord Fanny is a transexual and tries to pick a fight. Doesn't go well when the heroes take down entire military bases on their off days.
The graphic novel Mesmo Delivery begins with a fight between the main characters in a truck stop.
A backup feature in Savage Dragon shows Zeek eating at a diner that happens to be owned by a superhero couple: Rock and Widow. Zeek does not realize he has to pay for a meal so a fight erupts between him and Rock, which resembles the old 1960's fights between The Incredible Hulk and The Thing. Eventually, the matter is solved by Rock employing Zeek.

Fanfic

Defied in The Basalt City Chronicles. Two rival gangs of teens are in Bev and Dev's Cafe. They don't hate each other, but they'd be up for a good brawl. Problem: I'Brolent of the I'Brel Tribe is sitting between them. None of the teens in the cafe has any trace of doubt that I'Brolent can mop the floor with everyone if they try anything.

Film

In Superman II, Superman loses his powers and is reduced to mild mannered Clark Kent. He visits a diner, only to be harassed by a truck driver and roughed up. Later in the movie when he regains his powers, he goes back to the same diner and throws the truck driver down the length of the counter. He leaves, claiming that he's been working out.
In the first Back to The Future movie, Biff and his gang bully George McFly while in a diner and then turn their attention to Marty once he tries to stand up to them on behalf of his dad. Later, the characters go back to the same diner to beat up George only to have Marty trip them and sucker-punch Biff. This leads to the famous chase sequence outside. In the sequel, it's Biff's grandson who bullies Marty's son, leading to a similar sequence of events.
In The Presidio, Sean Connery's character has to take a Jerkass down in the middle of a diner, using only his thumbs. He says he'd only use his right thumb, as his left is far too powerful. Once the fight begins, he uses both thumbs and a foot.
The opening scene in Natural Born Killers also has a particulalrly nasty Diner Brawl and one of the few examples of the protagonists causing it.
In U-Turn, another movie directed by Oliver Stone, Sean Penn's character gets beaten up in a diner by a jealous boyfriend who is pissed that his girlfriend has a crush on him. He actually gets beaten up a lot in this movie.
Bad Day at Black Rock: Spencer Tracy as a one-armed Handicapped Badass wipes the floor with Ernest Borgnine.
Averted in Dumb and Dumber when Harold throws a salt shaker and accidentally hits a large redneck named Sea Bass in the head. Sea Bass marches over to the two men and is ready to kick their collective ass until they apologize and offer to pay for his meal. They end up sticking him with the bill instead and flee the diner.
In Howard the Duck, Howard has to fight for his life inside of a diner in order to avoid being cooked and served to customers. The Big Bad enters the diner during the same scene and begins attacking.
Played for laughs (note the obvious stunt double) in I'm Gonna Git You Sucka when Mr. Big's goons arrive at a local diner to beat up Jack Spade. Luckily Jack's mother is there to protect him, much to Jack's chagrin. Watch it here, 6:45-7:45. Includes a Bar Slide.
Love And Death On Long Island has an in-universe example. John Hurt watches a Movie Within a Movie called Hot Pants College II which apparently starts with a scene of holligans beating up Jason Presly at a 50's style diner.
The James Dean movie Giant. Seen here. Rock Hudson is the one delivering the beating, however.
Space Truckers has a fight scene in a diner In Space.
Happens in Robert Altman's live-action Popeye.
A History of Violence has a very violent, yet important instance of this trope. After the main character kills two robbers in his diner, it begins a cycle of violence and unearths his shady past.
Secondhand Lions has a memorable brawl, with Hub giving the teen delinquents who are hassling him fighting lessons, then working off some angst on them, then bringing them home to provide first aid and a lecture called "what every boy needs to know about being a man".
Indiana Jones and the Kingdom of the Crystal Skull has the scene where Indy and Mutt start a Diner Brawl between the jocks and the greasers in order to get away from the KGB agents that had them cornered. It even came with 50's brawling music!
The Kris Kristofferson movie Convoy begins with a diner fight between truckers and a corrupt sheriff. The truckers win but they have to flee across the state line in order to avoid trouble.
Kick-Ass features the hero's first fight just outside of a diner.
Heat depicts a scene in which Robert De Niro beats up the Token Evil Teammate while still in the diner booth. He follows up on the job outside.
The straight-to-DVD horror/comedy The Gingerdead Man starts with Gary Busey killing people in a diner before being caught and eventually sent to the electric chair.
In Captain America: The First Avenger, Steve Rogers briefly talks about getting beaten up behind a diner.
It's more of a diner hold-up, rather than a brawl, but the Pulp Fiction is bookended by the two different takes on the same diner scene where two small-time crooks try to rob the restaurant where Jules and Vince decided to have a breakfast.
Mickey Rourke's character slugs a gambler outside the eponymous eatery in Diner.
John Cryer and his two friends (one of which is played by Flea) get into a diner brawl with a large punk in the Western action comedy, Dudes.
Universal Soldier featured an example in which the hero started the fight, although not intentionally. Jean-Claude Van Damme played a cyborg who just discovered food and orders multiple plates without realizing that he has to pay for it. You can imagine where it goes from there.
The film Legion involves angels attacking a lone diner and its patrons in order to bring about the Apocalypse. One of the first scenes shows an angel is the guise of an alderly woman brutally attacking the main characters until she is shot dead.
In Streets of Fire, we're introduced to our hero Tom Cody when he arrives at a diner and finds some 50s-style bikers getting out of hand. He beats them all up and makes a big mess of the joint. It turns out that the hostess is his sister and a little annoyed that he trashed her business while protecting her honor.

Live Action TV

Supernatural: Sam and Dean get into a lot of diner brawls.
An early storyline of ER had a doctor and her husband being diagnosed with HIV. The husband had not known about this and accidentally infected a co-worker during a work-related accident. The co-worker saw the doctor and her husband in a diner in one episode and began to harass them until the husband stepped in and fought him. It was one of the more dramatic examples of this trope.
Red Dwarf had a reversed diner brawl in episode Backwards. It started with a patron uncracking Listers ribs, proceeded with Lister being thrown across a table, and finally Lister putting a tooth back into someone's mouth before the bar returns to normal activity.
An episode of Community depicted the cast dressing up as Pulp Fiction characters in a diner for Abed's birthday. When Troy damages Abed's gift by accident, he and Chang get into a fight in the diner, resulting in them hitting the jukebox.

Literature

In Harry Potter and the Deathly Hallows, the main characters run into a diner to escape the Death Eaters, but two show up because they are able to track anyone who speaks Voldemort's name.
A Nightmare on Elm Street: Perchance to Dream has a Fast Food Restaurant Brawl, caused by everyone being rendered edgy, paranoid and violent due to Jacob Johnson stopping everyone in Springwood from dreaming for at least a month (to protect them from Freddy). Later on in the police station patrons are still fighting, with several cops now involved.

Music

A brutal example is on the cover of this album.^[context?]

Tabletop Games

The introductory Feng Shui adventure, "Baptism of Fire," opens with one of these, with the heroes fighting off a vicious gang that have come to shake down the owner of the establishment.

Video Games

Street Fighter IV has a level in which opponents fight outside a 50's style diner.

Web Original

The Food Fight which caps V2E1 of RWBY takes place in a dining hall, not a diner, but certainly counts.

Western Animation

This happens in two Fleischer Popeye cartoons We Aim To Please and What - No Spinach?.
Dan Vs. has one. Well, dinner theatre brawl actually, but pretty much the same. Incited by Dan.

Dan: "Who would've thought an angry mob would get so out of hand..?"

American Dad! gives us Stan vs. Bullock.

Real Life

Search for "Dennys Brawl" and at least three different viral videos will pop up depicting nasty fights witnessed in the diner-chain. They must be putting something in the Moon Over My Hammy
- Denny's, both in Japan and in cities in the US where they may be, has become popular among the Yakuza for some reason. There was at least one fatal shooting at a Denny's in Japan that happened when two enemy yakuza members met.
- This tends to happen at 24 hour diners or open late diners in general. Often, 24 hour diners or late-open diners are in areas with a lot of nightlife. The Diner Brawl in these cases is often just a Porting Disaster of the Bar Brawl.
The famous Mel's Diner in West Hollywood was trashed in a particularly nasty late-night food fight that turned into a violent brawl. And of course, it's up on YouTube.
- Mel's Diner on the Sunset Strip is somewhat known for these, for the above reason - its nightlife proximity.