Super Mario 64 (N64)

Forever Wing Cap music

In Course 1, pick Star 1 so the Big Bob-omb will be on top of the mountain. Get the Wing Cap, then quickly shoot yourself to the mountaintop via the cannons. Talk to the Big Bob-omb, then use the warp zone in the nearest cave. When you come out at the bottom, you won't have a Wing Cap, but the flight music will play on and on.

You can also do this in Star 2 of Course 1. Get the Wing Cap, talk to Koopa the Quick, then warp. When the race is over, the flight music will start up again.