Boo is the human toddler at the heart of Pixar's Monsters, Inc., released in 2001, where monsters Sulley and Mike try to return her home while keeping her hidden from the monster world. The sushi restaurant sequence became a fan favourite because it turns a quiet, wide-eyed child loose in a frantic adult setting, creating comedy from contrast rather than dialogue. As short clips spread on soundboards and social video, Boo's laughter became shorthand for innocent mischief, and creators still reach for it when a scene needs warmth, surprise and childlike chaos in just a few seconds.