Shoot Everything That Moves

"Zoe: Okay, people. If it moves, shoot it. Kaylee: Unless it's the captain! Zoe: Unless it's the captain."

- The Firefly crew plan a rescue mission

They've got a job to do. They're facing heavy opposition. A strategy is called for.

Like, say, "shoot all the other guys". Why make things complicated?

Sometimes the good guys have to go into heavily-defended territory. There aren't any neutrals there, and it's too dangerous to leave any of the opponents alive. Maybe they're the defenders and the only things coming towards their position are trying to kill them.

Or, hell, maybe you just like shooting people. But to be clear, if you're the sort of person (or army, or species) that fights every fight this way, then you're just Trigger Happy, and this trope doesn't really fit you. This trope is about those situations where that really seems like the only solution to whatever problem you're in. Of course, if you're Trigger Happy, you may jump to that conclusion a little faster.

More Dakka might come in handy now, but it's not necessary—sometimes it's knives or clubs. Usually this isn't Gotta Kill Them All, because you've got some objective other than killing people—say, you're rescuing someone, or getting out of the prison camp, or making the Nazis surrender. But for whatever reason, if you see anything alive, you need to make it less alive. (If you want to put a positive spin on things, just call it a "Target-rich environment.")

Similar to Leave No Survivors. But in that case, the emphasis is on making sure everyone is dead—if someone hides and you miss him, you've failed. Shoot Everything That Moves is more about the situation where everything you see is a threat and a target—if something runs or hides and doesn't come out until you're gone, that's just fine. See also Leave No Witnesses, for the situation where the people around you aren't imminent threats, but they know too much for you to leave them alive.

Too many videogames to count are played this way, from Space Invaders on up. So only list video games that aren't just Everything Is Trying to Kill You (and you're returning the favor).

Not to be confused with Anything That Moves, though with some people, you never know...

Comic Books

 * The Boys: When Wee Hughie is given his standard-issue black leather longcoat, he's told to win fights by beating the crap out of anything not wearing one. This simple advice has apparently saved Butcher's life more than once.

Film
"We are going in with the first wave, means more bugs for us to kill. You smash the entire area, you kill anything with more than two legs. You get me?"
 * Starship Troopers has a lot of fights like this.

"Murtaugh: What's the plan? Riggs: Wait for my signal, then just go in and shoot those fuckers."
 * 28 Weeks Later has a fairly horrific scene where the soldiers are attempting to secure a compound by shooting infected, except that due to the speed and the confusion it's hard for them to make out just the infected. Then the snipers get the order that everyone is considered a target...
 * In Wild Wild West, President Ulysses S. Grant comments: "And you West, not every situation calls for your patented approach of shoot first, shoot later, shoot some more, and then when everybody's dead try to ask a question or two".
 * In Lethal Weapon 2, Riggs tells Murtaugh the plan for rescuing Leo.


 * The Doom movie ups this from moves to breathes.

Literature

 * Mentioned a few times in the Vorkosigan Saga as a viable combat tactic when using stunners since it reduces friendly fire mistakes from potentially lethal to merely annoying. Similarly useful for hostage situations.
 * Several instances in Animorphs, where controllers start shooting anything that moves for fear it might be an Andalite in morph.

Live TV

 * The Firefly episode "War Stories", quoted above. The crew needs to rescue Captain Reynolds from Niska's satellite, and Zoe gives this as instructions.
 * In Stargate Atlantis, O'Niell gets annoyed with Woolsey continually calling out "General, is that you?" when he hears something. So when he needs to go activate a control in a flooded area, he hands Woolsey a gun and says, "If something is coming, then it isn't me. Don't call out to it. Shoot it."

Newspaper comics
"Riley: "\[The NRA\] got this thing where you just go out and kill everything you see. They call it hunting.""
 * In Boondocks, Riley is a fan of accusing people of this.

Tabletop Games

 * The 'Annihilate' mission in Warhammer 40,000 and the basic victory-point-based mission in previous editions and in all of the subordinate games give each side the objective of killing the enemy.
 * This is the main strategy of any Ork army.

Video Games
"The only advice I'll give you when you're in the jungle, shoot anything that moves. Then shoot the things that don't move, just to be sure."
 * Knights of the Old Republic II: Mentioned on the jungle world of Dxun, home to some reconstituted Mandalorian Clans (basically Proud Warrior Race Barbarian Tribe (In Space). Specifically, the Mandalorian quartermast Kex says:

"Agent Zildi: You assume all non-asura are targets? Stop extrapolating, you pile of illogical circuitry! Fine. Let's make this simple. If it's bipedal, then it's an asura. Shoot anything with more than two legs!"
 * When the eponymous duo from the first Ratchet and Clank game intercept a message from Ultimate Supreme Executive Chairman Drek to his troops, they see that his instructions to them in regard to the invasion of a city were as follows:
 * 1) Destroy everything that moves.
 * 2) Steal the power generators from Gorda City
 * 3) Destroy everything that doesn't move.
 * 4) Oh, and don't forget! Have fun.
 * Syndicate Wars was usually played using point and click, selective attacking - but you had the ability to pump your agents full of psychotropic drugs that would either make them auto-attack anything with a weapon, or just anything that moves and is within combat range. Not usually useful, but spectacular with the right weapons.
 * The Official Strategy Guide to Mechwarrior 2 actually had the advice "If it moves, shoot it. If it doesn't move, shoot it until it moves, then apply rule 1."
 * Clicking the "Story" button on the menu of Kill Monty brings up the words "SHOOT EVERYTHING" in massive letters.
 * In Eat Lead: The Return of Matt Hazard, the main character is initially given a laundry list of objectives, before complaining about it. His Voice with an Internet Connection then gives him a new, simpler objective, which is the trope word for word.
 * The developer commentary in Left 4 Dead uses the phrase several times... chiefly when describing how certain Special Infected were designed to make players avert the trope.
 * In Guild Wars 2: Heart of Thorns, one of the missions of the Rata Novus event chain involves an asura NPC trying to reactivate a long-abandoned city's automated defense system to help deal with an attack by a horde of giant insects, and struggling with obsolete legacy programming from an era back before the asura were allies with other races.

Webcomics
"Virus: "What's going on?!" Harry: "Whatever it is, we'd better stop it!" Virus: "How?" Harry: "The only way we know how... kill everything that isn't us!""
 * Exterminatus Now is fond of this approach.

Web Original

 * This is what the basic plan for the final battle of Shadowhunter Peril turned out to be. Yes there were battle strategies, yes their primary goal was to get the kids out of the city, but once that was ensured and a few of the multiple Big Bads were occupied, it turned into shoot-or-stab-anything-that-isn't-remotely-human-until-it-is-unrecognizable-chunks. and it worked quite well.

Real Life

 * By some accounts, the U.S. designated "free-fire zones" in Vietnam, in which servicemembers were to consider all unidentified people as hostile, and shoot on sight. (If so, this would be a violation of The Laws and Customs of War.) Depicted in several Vietnam war movies.
 * This was a misunderstanding of the term 'free-fire zone'. In actuality, it means 'If you see something in there, you're not allowed to shoot it unless its an enemy combatant but you're free to open up on it as soon as you do identify it as an enemy instead of having to report in 'enemy sighted, request permission to engage'. Otherwise, you're not allowed to shoot at anything unless a) you've gotten on the radio and received clearance or b) it shoots at you first.' The purpose of this is to prevent friendly fire -- if friendly units are expected to be maneuvering in the zone, nobody is supposed to shoot at anyone until after high command has had a chance to radio both friendly units to make sure they're not reporting spotting the other one. On the other hand, if there is a zone where no friendly troop movements have been scheduled then everybody you see wearing combat gear and carrying a rifle in there is the enemy, so feel free.
 * US Marines General Chesty Puller is reported to have said "All right, they're on our left, they're on our right, they're in front of us, they're behind us...they can't get away this time."
 * There's a piece of conventional wisdom that goes, "If it moves, shoot it. If it doesn't, shoot it just in case."
 * An alternate version from World War II. "If it moves, shoot it. If it screams in German, shoot it again!"
 * Standard video game tactics: "If it moves, shoot it. If it doesn't move, shoot it anyway. If it has a functioning brain, shoot it first. If it shoots back, run."
 * Operation Freedom Deal: "A massive bombing campaign in Cambodia. Anything that flies on anything that moves."