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Gas Cylinder Rocket
Whether accidentally or as an Improvised Weapon, the nozzle of a pressurized gas cylinder is easily broken off in fiction. When this happens, the canister will go shooting away like a rocket, blasting itself into the air and smashing through any thing (or anyone) unfortunate enough to be in its way. Sometimes this serves as an attack or a battering ram; occasionally, a reckless character will actually ride the thing.

Less credible, but still common, is a gas cylinder being ruptured by a gunshot and possibly shooting off like a missile. Whether this results in a Gas Cylinder Rocket or merely Stuff Blowing Up generally depends on whether the target it's being used against is right next to it or somewhere up ahead.

Both variations are partially Truth in Television. The valve is the most fragile component of a pressurized gas cylinder, and the gas inside does store more than enough energy to hurl the cylinder around the room. For just this reason, gas cylinders are supposed to have a protective cap screwed over the valve at all times when not actually in use. However, breaking the valve isn't exactly easy, and punching a hole in the cylinder itself is much, much harder. A gunshot may not even make a dent (depending, of course, on the tank, the gun, and the round).

Sister trope to Aerosol Flamethrower. Subtrope of Improvised Weapon and Explosive Propulsion. Compare Recoil Boost, which uses More Dakka for propulsion instead of compressed gas.

Examples:

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    Film 
  • In Freddy vs. Jason, Freddy launches a series of scuba tanks at Jason when they're battling at the abandoned Camp Crystal Lake.
  • Bronson in Street Trash is killed when a gas cylinder is send flying his way, and it removes his head.
  • There is a literal variation in SpaceCamp that is definitely not Played for Laughs. After Andie is successful in supplying the space shuttle Atlantis with an extra supply of oxygen, she forgets to turn off the oxygen tank when she takes the hose off, which results in the oxygen tank rocketing backwards with her holding on to it, until she gets knocked unconscious from running into the side of the ship.
  • In Jumanji, Peter creates a rocket sled in a sporting goods store by strapping two scuba tanks to a canoe, and then breaking the ends off by dropping a barbell on them.
  • In Chain Reaction, Eddie chops the valve off a tank of hydrogen gas to shove open a safety door so he and Dr. Sinclair can escape.
  • In Scooby Doo Monsters Unleashed, Scooby uses a fire extinguisher to freeze a monster and then ride it around on the frozen monster like a snowboard. He then kicks off the end of the extinguisher and rides it briefly like a rocket.
  • Averted in Jaws, when the gas canister merely explodes rather than takes off (but see Mythbusters example below).
  • An unlucky victim in the fourth Final Destination movie is struck by one of these and slammed into a chain-link fence with enough force to turn his back into chunks.
  • In Transporter 2, Frank pushes a hospital cart with a gas cylinder on it into Lola's path, then throws a chemical carboy into the light fixture above it. The collapse of the fixture knocks the nozzle off the cylinder and sets its gas on fire, causing it to shoot down the hallway and blow up right next to Lola.
  • In 3 Ninjas: High Noon On Mega Mountain, the boys try to dispose of a time bomb by strapping it to three oxygen tanks and then breaking the nozzles off with a hammer. However, they turn out to not be strong enough to break them. Fortunately, Dave Dragon shows up and is strong enough to break them. For bonus points, the bomb gets propelled to the escaping bad guys' boat just as the timer hits zero.

    Live-Action TV 
  • MythBusters:
    • The group tested this one, and confirmed that a large gas cylinder under sufficient pressure could smash its way through a concrete wall (!), although it slid across the floor rather than taking off and flying.
    Jamie: It was the lard that did it.
    • They also got this effect accidentally when they simulated the ending to Jaws. Rupturing the gas cylinder didn't cause it to explode, but it did blow backwards with sufficient force to tear their foam-latex shark head to pieces and deform the shipping container they were using as a bunker.
    • Subverted when they tested an Urban Legend about a propane tank that blasted off like a rocket, as every attempt to rupture or ignite one either failed or blew it to pieces.
  • In an episode of Stargate Atlantis Ronon tried to use an oxygen tank rocket to break down a sealed door, having gotten the idea from watching Jaws. It didn't work.
  • An episode of Sliders ("The Exodus", part 2) had Quinn and company locked in a room as the evil Rickman was sliding without them. They used an oxygen tank attached to a rolling metal hospital tray as a rocket to bust the door open.
  • Due South: In 'Mountie on the Bounty', Fraser and Ray K use ruptured air tanks as rocket packs to escape the sinking ship.
  • On CSI: Crime Scene Investigation, a canister of nitrous is ruptured by a stray bullet during a shooting at a rave. The canister lifts off, trailing sparks, and flies erratically back and forth before slamming down among the party-goers, injuring several who were too high to get out of the way.
  • Turned up a few times in London's Burning, usually played somewhat more realistically in that the source of the explosion was the building or vehicle the cylinders were stored in being on fire, which is easily the most reliable way of getting this effect in real life. The seventh season ended with a particularly memorable example after a fire broke out in a builder's yard behind a row of terraced houses, with about fifty of them shooting off like bottle rockets and crashing down all around whilst Blue Watch tried frantically to evacuate the local residents and get the fire under control.

    Video Games 

    Web Original 
  • In Chapter 40-2 of We're Alive, Victor shoots a scuba tank that a Little One had become entangled with, sending the tank and Little One skidding across the street at high velocity.

    Western Animation 
  • In Bolt, a gas canister at the animal shelter is damaged and goes shooting into the parking lot, where it knocks down an illuminated sign that topples onto a car.
  • In the Simpsons episode Mountain of Madness, a propane tank attached to a cabin gets its end knocked off and propels the structure downhill:
    Homer: [praying] Dear Lord, protect this rocket house and all those who dwell within the rocket house.
  • In Rio, Blu attaches Nigel's leg to a fire extinguisher, then sets it off. The evil cockatoo is dragged from the plane by the rocketing canister.
  • In Over the Hedge, a broken propane tank sends a grill skyward, even flying over an airplane.
  • Instead of a gas canister, a malfunctioning surgical laser goes ballistic in the Roger Rabbit Short "Tummy Trouble".

    Real Life 
  • Liquid nitrogen tanks have pressure relief valves for a reason, folks.
    ... the force of the explosion was directed upward and propelled the cylinder, sans bottom, through the concrete ceiling of the lab into the mechanical room above. It struck two 3 inch water mains and drove them and the electrical wiring above them into the concrete roof of the building, cracking it.
  • There's a welding safety poster floating around out there showing a mostly demolished building, with Those Two Guys standing around outside remarking, "Looks like Bob forgot to secure his oxygen canister again."

From Dress to DressingImprovised IndexImplausible Boarding Skills
Eyepatch of PowerJustForFun/Tropes Examined by the Myth BustersGet a Hold of Yourself, Man!
Feed It a BombWeapons and Wielding TropesGrenade Hot Potato

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