Never heard of this until the other day, for anyone that hasnt watched its kinda motorised Jackass, bikes, cars, skimobiles etc.

Theres a good one in Puerto Rico where a couple of them get beat up by Migual Cotto and Juan Urango, funny stuff.

Couldnt find clips of those so heres some bloke beating up friends and family.

http://www.youtube.com/watch?v=rJ9p_QluOSE