The Gaster Blaster comes from Undertale, the 2015 role-playing game created by Toby Fox. In battle it is the signature attack of Sans, a floating skull that opens its jaws to fire a beam, and its name links it to the mysterious W. D. Gaster. Clips of the charge sound spread through YouTube fight recreations, fan animations and soundboards, where the short build-up became instantly recognisable to players. It remains popular because that one rising second tells an Undertale fan exactly what attack is about to happen.