The line comes from the American television series Dexter and is delivered by James Doakes, played by Erik King. Doakes's intense suspicion of Dexter made the abrupt confrontation especially memorable. The quote later spread through reaction images, video edits, remixes, and parody variations that changed the final word while preserving the recognizable opening. It remains popular because the delivery is immediate, aggressive, and easy to synchronize with an unexpected entrance or discovery, even when viewers have not seen the original episode.