The pull up warning comes from the ground proximity warning system fitted to modern airliners including the Boeing 777, which entered service in 1995. The system monitors altitude and terrain closure and issues a synthetic voice alert when a collision risk is detected. Recordings and simulator recreations spread through aviation forums, flight simulator communities and YouTube, where the short command became familiar even to non pilots. It remains popular because the wording is unmistakable and instantly understood as a last second warning in both serious and comic flight videos.