The line comes from John Carpenter's 1988 film They Live, spoken by wrestler Roddy Piper as John Nada shortly before a long alley fight scene. It became even wider known in 1996 when Duke Nukem 3D borrowed it for its hero, cementing it in gaming culture. Since then it has lived on in GIFs, soundboards and edits as the definitive tough guy one liner, quoted whenever someone wants to signal they have run out of patience and options.