The laugh originates from Fallout 4, Bethesda's 2015 post-apocalyptic role-playing game, where the Idiot Savant perk can randomly multiply experience gained. The lower a character's Intelligence stat, the higher the trigger chance, and the activation is marked by a Vault Boy animation and this distinctive chuckle. Clips of the perk sounds were later ripped from the game and shared on soundboards and meme pages, where the laugh detached from the perk itself and became a general reaction for silly luck, bad ideas and chaotic gameplay moments.