Six Mad Pianos as seen in Christmas 2013: The 12 Idiots of Christmas. Mad Piano is an angry piano with chomping teeth who appears in some of SuperMarioGlitchy4's bloopers. It has been played by Steve and Peach once. Appearances Christmas 2013: The 12 idiots of christmas 101 Ways for Mario to Die (The Right Way!) 50,000 Subs! Stupid Luigi's Mansion Trivia The Mad Piano is sometimes called the Killer Piano by fans. The Mad Piano first appeared in the game Super Mario 64. Gallery The Mad Piano as seen in Super Mario 64.Add a photo to this gallery "I have absolutely no idea what's going on." This article is a stub. 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