The Gaster Blaster comes from Undertale, the 2015 role-playing game created by Toby Fox. In the game the weapon is linked to W. D. Gaster and is most famously used by Sans during his boss fight, where floating skulls fire beams at the player. Clips of that fight spread widely through YouTube, fan games and Undertale animations, turning the firing noise into a shorthand for an overwhelming attack. It remains popular in edits because it is short, recognisable, and tied to one of the game's most talked-about battles.