Undertale, released in 2015 by Toby Fox, features skeleton brothers Sans and Papyrus, both known for bone based attacks during battles. Clips inspired by those fights have circulated for years in fan edits, animations and meme soundboards, where short projectile sounds became shorthand for a Papyrus style attack. This flying bone variant is shared under the Bitti name on meme boards and is kept alive because it instantly signals an Undertale joke to fans while still working as a generic cartoon whoosh for viewers who do not know the game.