The line comes from Dexter, the Showtime crime drama that ran from 2006, where Sergeant James Doakes, played by Erik King, constantly suspects Dexter Morgan. His blunt ambush greeting became the character signature moment and was clipped endlessly online. It spread through YouTube edits, Vine loops and reaction videos in the early 2010s, long after the episode aired, because the delivery works without context. It remains a staple reveal sound on soundboards, reused whenever a video needs an instant, recognisable caught in the act moment.