Warp Pipe
Warp Pipes are a frequent sight in Super Smash Bros. games, hailing from the Mario series.
In Super Smash Bros.
The Mushroom Kingdom stage has three warp pipes. Two of them can be entered, and the character which entered it will appear in one of the two others randomly, though if one is blocked, they will always come out of the other.
Mario and Luigi's on-screen appearance has a Warp Pipe rise from the ground for them to jump out of onto the stage.
In Super Smash Bros. Melee
In SSBM, Warp Pipes commonly serve as platforms, such as in Yoshi's Island: Yoshi's Island. In Mushroom Kingdom Adventure, they also serve as "checkpoints," in that if the player dies, they will re-spawn at the last Warp Pipe they passed.
In Super Smash Bros. Brawl
Mario's on-screen appearance has a Warp Pipe rise from the ground for him to jump out of onto the stage, repeating its role from the original game.