Sans is a skeleton character from Undertale, the 2015 role playing game created by Toby Fox, best known for his relaxed jokes and the intense boss track Megalovania. This depression version is not his battle theme but a fan circulated, slowed piano arrangement that reframes his music as something somber. It spread through YouTube edits, TikTok posts and soundboards where users paired it with sad captions and lonely scenes. Its continued use comes from that sharp contrast between a familiar character and an unexpectedly vulnerable mood.