Gun Nut is a perk in Fallout 4, Bethesda's 2015 post-apocalyptic role-playing game set in the Commonwealth. The perk lets players access higher ranks of gun modifications at weapons workbenches, so its associated sound became familiar to anyone who spent time customising firearms in the game. Clips of the effect later circulated on soundboards and in video edits detached from gameplay, where the brief mechanical noise works as shorthand for crafting, upgrading gear or preparing for combat in the wasteland.