The sound comes from Ex Machina, the 2015 science-fiction film in which Oscar Isaac plays Nathan Bateman, a reclusive tech founder testing an artificial intelligence. In one of the film's most shared scenes, Nathan unexpectedly breaks into a choreographed dance with Kyoko, turning a tense story into a moment of pure absurdity. Clips of that dance circulated widely online, and the line hyping his moves became a handy shorthand for any sudden dance break. It endures because the contrast between the film's serious tone and the joyful dancing still catches viewers by surprise.