Mr Tree is a character from Sprunki, a fan-made music-mixing game inspired by Incredibox where players combine characters to create beats. In the game's horror mode, familiar characters are redrawn in darker, more disturbing forms, and their sounds shift from playful loops to unsettling audio. That contrast helped Sprunki horror clips spread widely on YouTube and TikTok, where creators reuse character sounds for edits, reaction videos and short horror stories. Mr Tree remains popular because his calm, natural design makes the horror version feel especially wrong, and the sound works as instant shorthand for something innocent turning sinister.