This is an easy glitch that requires NO CHEATS!!
How to perform glitchEdit
I'm not sure if this is really a glitch, but it is very fun to do! In level one you have to get the rocket car from the golden mansion. Next drive to the Springfield Tire Fire. Make sure you are pointing away from the power plant. Go as far back as you can keeping a straight trajectory, then push the button AS HARD AS YOU CAN for maximum speed! When you fly off the tire fire you should soar into the back of the map and the physics will make like you hit a wall!
Who discovered the glitchEdit
I discovered the glitch but others may have too.