Happy Wheels is a ragdoll physics browser game created by Jim Bonacci and released by Fancy Force in 2010, built around gory, slapstick crashes with characters on bikes, wheelchairs and other vehicles. Its injury screams spread through early YouTube gameplay and fail compilations, where the exaggerated pain became part of the joke. Like the Roblox oof, this scream survived the Flash era as shorthand for a character getting hilariously hurt, and creators still reuse it in game edits and meme videos long after the original levels.