The line comes from Arrested Development, the American sitcom that premiered in 2003, where Will Arnett plays George Oscar Bluth II, known as G.O.B., a struggling magician and eldest Bluth son. 'I've made a huge mistake' became one of his recurring admissions after his schemes unravelled, and fans lifted the clean, isolated delivery for reaction videos and memes. Because the phrase fits almost any self-inflicted failure, it spread beyond fans of the show and remains a shorthand for comic regret in short-form edits.