on either homer's first level or marges level, if you enable horn jumps, and go over to the river near cletus's house, on the bridge if you jump into the river at a fast speed with the horn jump you go into a strange world. in this world you can reach a top speed (if you enable speedo) of 720!!! but only if you have activated max speed cheat but at this speed it resets itself and you stop at a standstill but you stay in the world!!!!