Casket

Caskets are long narrow boxes that serve as obstacles in Super Mario 64 and Super Mario 64 DS. They appear only 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.