The pull up callout comes from aircraft ground proximity warning systems, designed to alert pilots when terrain or a low altitude becomes dangerous. Recordings and recreations of cockpit alarms from jets like the Boeing 717 have spread through flight simulator communities, aviation forums and meme soundboards. The short, commanding phrase became a reusable reaction sound online because it needs no context to understand. Creators borrow the realism of a real cockpit warning to make fictional crashes, drops and failures feel instantly urgent and recognisable.