Check these out. I've seen them at car shows in La Mesa and Escondido...this is just awesome fun!
They are created by California-based builder Tom Wright, the original set of modified bumper cars came from the Long Beach Pike amusement park's discards. Instead of watching them join the trash heap, he took out the Harley motors, replaced it with 750cc Honda and Kawasaki boxes, and redesigned them to pass city driving standards. His fleet now consists of eight crazy-looking street bumper cars (culled from different amusement parks), all licensed to give your hottest ride a run for its money.
A couple of the cars can reportedly go up to 160mph, which seems awfully scary for a car with such a short wheelbase.
The only thing I would miss is watching the sparks fly from the ceiling!!!