'Fire in the hole' began as a real military and mining warning shouted before setting off an explosive charge, giving anyone nearby time to take cover. Video games adopted the line as a radio callout, most famously in Counter-Strike when a player throws a grenade, which taught a generation of players to associate it with an incoming blast. Clips of the shout later spread on soundboards and in meme edits, including Geometry Dash lobotomy memes, keeping it in use as a short warning for any sudden explosion.