Rattlebones comes from Slap Battles, the Roblox slapping game where players collect gloves with different powers and sounds, and its angry rattle is tied to that glove's spooky, skeleton-like theme. Players first heard it in-game, then shared the clip on soundboards and in edits, where its rattlesnake-like buzz made it easy to reuse outside the game. Search interest around rattlesnake sounds helped it travel further, and creators still reach for it because the sound is instantly recognisable as a warning, even without any game footage on screen.