Wheelman 50cc Skateboard

At 50cc, it does seem to be a bit overpowered for a skateboard, but there it is. It has a hand controller (with the obligatory "dead man's switch"), spokeless wheels, and a stated maximum speed of 25mph- though I suspect there's a lot more capacity there with creative carburation and gearing. If this doesn't scare the bejeesus out of you, you can buy one here for just under $500.