The line comes from Stanley Kubrick's 1980 horror film The Shining, where Jack Nicholson plays writer Jack Torrance as he descends into madness at the isolated Overlook Hotel. In the famous bathroom scene, he axes through the door and grins through the hole, borrowing the cheerful introduction Ed McMahon gave Johnny Carson on The Tonight Show. That contrast between a light entertainment greeting and a violent threat made it instantly quotable, and it has since become a staple reaction clip for jump scares, surprise entrances and horror edits online.