Enable the "All cars and tracks" code, then do a quick race. Choose one of the last six cars (they are the fastest) and choose the "Crashalley Run" race in the Bonus Class races. It is the last one on the right. When the race starts, do about the first two laps so that you have a nitro boost. You should have earned one by now, as there are many cars flying around to smash into. Once you have some nitro, go as fast as you can down one of the bumpy straightaways. When the turn comes up, hit the nitro and blast into the wooden and concrete barriers that make up the edge of the track slightly to the right. Your driver should fly out and go far away from the track, going over the edge of the map and fall into blackness. The game will reset after a while.