TCAS, the Traffic Collision Avoidance System fitted to commercial aircraft, issues resolution advisories when its surveillance detects a conflict with another transponder equipped aircraft. The climb instruction is one of its standard spoken commands, delivered in a distinctive synthetic voice so pilots follow it immediately, even over other traffic instructions. Recordings and simulator recreations of cockpit alerts spread through aviation videos, flight simulation communities and meme edits online. The phrase remains popular because the wording is instantly recognisable, short enough to sample cleanly, and dramatic without needing any visual context to understand the urgency.