The Pyro is one of the nine playable classes in Team Fortress 2, Valve's team based shooter first released in 2007. Dressed in a fireproof suit and gas mask, the character is known for a flamethrower, an upbeat manner and speech that is almost completely muffled. Short voice clips like this grr have circulated for years on gaming soundboards and in fan edits, where players isolate a single reaction out of context. Its lasting appeal comes from that instantly recognisable muffled tone, which signals the Pyro even without any gameplay footage.