Enter  these  cheats in the main menu and you will hear a signal.
To remove the cheats, just enter again.

BANARNE           Increase the height of the cars 
FILMJOLK          Makes the screen go berserk
SKUNK             Remove the body of the car 
SLASKTRATT        All cars
STRINGS           Flattens all opposing cars
SURMULE           All tracks
SVINPOLE          Change camera view