Sans is a skeleton character from Undertale, the 2015 role-playing game by Toby Fox, and his boss fight on the game's Genocide Route became one of its most talked-about moments. Known for dodging, fast attacks and a famously punishing difficulty curve, the fight turned Sans into a lasting gaming meme. Clips like this spread through gameplay videos, edits and short-form posts, where fans reuse the reference to joke about impossible bosses, unfair difficulty and the gap between Sans's relaxed personality and his deadly battle style.