Black Hawk Down
"Helicopter" Homer utters this phrase twice after crashing into the locker outside of Bart's classroom and falling to the ground. Black Hawk Down is a 1999 novel about the US Army Rangers and other military units attempt to capture Somali warlord Mohamed Farrah Aidid in Mogadishu. An intense battle occurred between the military units and the local citizenry and militia. A UH-60 Black Hawk helicopter was shot down and a rescue attempt was mounted soon after which is where the phrase originated. The book was made into a movie in 2001.