Select the Hot Rod, which is unlocked through Free Ride Extreme. Set the Traffic Density to 0 and select City-Daytime. Spawn at Hoboken, then immediately drive straight and left. Follow the road along on the last lane to the right. When you go onto the straightaway, go as fast as you can. Keep going onto the field, then hit the train tracks going at top speed. If done correctly, you should fly into the building. However, instead of crashing, you should go through it. You should then go through the ground afterwards. You will be stuck and your car should start spinning. The only way to exit is to restart Free Ride by quitting the game.