On the final level as Homer, drive to where the firetruck is a long ramp. As you jump off it, look off to the side. You will see a little car with an antenna. Slowly drive up past where the truck attaches to the ladder/ramp then drive fast towards the building with mildew under the roof. You could also climb up the other firetruck that is in the wreckage next to the building. Jump on the ladder, then go up to the top of the firetruck. Next, go over the side of the roof with the horizontal wood, then to the top of the roof with the RC car.

On top of the Krusty Burger on Homer's final mission, drive your car up the fire truck ladder. Try to land on the top of the Krusty Burger. Get out of your car and you will see what looks like a remote control car. You can actually drive it around
town.