Wander Over Yonder is a Disney animated series about Wander and Sylvia travelling the galaxy, and the Phantom Mime is a silent, unsettling villain from that world whose sudden appearances are played for shock and comedy. Fans lifted this brief scream from one of those jumpscare moments and shared it on soundboards, where short cartoon reactions are easy to reuse. It has stayed popular because it is instantly recognisable to fans of the show while still working as a generic shock sound for anyone who has never seen it.