The line comes from Dexter, the Showtime crime drama about a forensic analyst who secretly works as a vigilante serial killer, and is spoken by Sergeant James Doakes, the detective who suspects Dexter is hiding something. Doakes' blunt catchphrase became one of the show's most quoted moments, spreading through YouTube compilations, reaction videos and soundboards long after the series ended. It endures because the delivery is instantly recognisable and perfectly timed for ambushes, reveals and prank payoffs in short-form video.