Bouncy Wario

Bouncy Wario is one of Wario's famous transformations in the Wario Land series of games. If hit by the hammer of an Ape, Hammer-bot, or Hammer Warrior, Wario will be squashed, only to spring right back up again in this state, used to spring to new heights. In all three versions, Wario has a time limit before he will return to normal (hitting a spike will also work). However, in Wario Land II and 3, pressing A will let Wario jump slightly higher, while in Wario Land 4, pressing A will cause Wario to jump up until he hits an obstacle, allowing him to return to normal.

Trivia

 * In Super Mario Galaxy, Mario can use a similar form: Spring Mario.