Mad Piano

The Mad Piano is a piano appearing Super Mario 64 and Super Mario 64 DS. It looks normal at first, but when Yoshi, Luigi, Wario or Mario goes near the instrument, it begins to open and close its lid, revealing sharp teeth. The Mad Piano then proceeds to chase and attack the trespasser until they have left the room where the piano lies. The Mad Piano only appears in Big Boo's Haunt. A Red Coin is found beneath it when the characters have the mission to pick up the 8 Red Coins hidden in the level.

It is impossible to defeat this enemy, so it is best to just avoid it.

A Mad Piano possibly appears in Mario Party 8 in King Boo's Haunted Hideaway, playing the Super Mario Bros. underground theme.