The line comes from the 1996 Christmas comedy Jingle All the Way. Arnold Schwarzenegger plays Howard Langston, a father desperately searching for a Turbo-Man action figure. During a phone conversation, Howard hears his neighbor Ted eating cookies at his house and angrily orders him to put the cookie down. Schwarzenegger’s intense delivery turned the brief movie quote into a lasting reaction clip, frequently reused in food memes, prank edits, diet jokes, and videos where someone is caught taking something they should leave alone.