The line comes from Stanley Kubrick's 1980 horror film The Shining, where Jack Nicholson plays writer Jack Torrance descending into madness at the isolated Overlook Hotel. In the famous bathroom scene, Torrance hacks through the door with an axe and delivers the greeting, a nod to the introduction used for Johnny Carson on The Tonight Show. The moment became one of cinema's most quoted scenes and later spread through reaction videos, edits and memes, where the shout signals an unwelcome or over-the-top entrance.