The Elevator is a simple glitch involving two or more persons occupying the same space.
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This is accomplished usually against a wall or any other enclosed space where a player can easily stand on top of another player. The bottom player (and, if he is experienced in the timing of the technique, the top player) jumps continually. The bottom player's jumping causes the top player to rise slightly then fall after the bottom player has landed. Eventually, the bottom player will jump up at the precise moment as the top player sinks down, and the players will occupy the same space. The physics engine will then cause both players to rise continually until they have struck an impediment or been moved by an attack.