Casket

Caskets are long narrow boxes that serve as obstacles in Super Mario 64 and Super Mario 64 DS. They appear in a room on the haunted mansion's second floor in Big Boo's Haunt, where they lift themselves up from one side and slam back down, two of which have a Red Coin underneath them. If Mario, Luigi, or Wario is crushed by a casket as it falls, he loses three wedges of health. In Super Mario 64 DS, only one Red Coin is found under a casket.