Sans is the easygoing skeleton from Undertale, the role-playing game released by Toby Fox in 2015, and he became a lasting internet favourite thanks to his humour, music and boss fight. YouTube Poop, a long-running style of deliberately distorted video editing, frequently reuses game characters for surreal jokes, and clips like this circulate as short soundboard sounds rather than as full videos. They stay popular because Sans is instantly recognisable, the edits are easy to drop into new memes, and the humour works even for viewers who have never played the game.