the abrasive wheel to the head means something ALOT worse for me than most folks though. in 1999 my wife and i were in an accident, the passenger airbag in the 1994 neon hot me with enough force that it causes total amnesia, i came most of the way back after 2 months but there was still stuff i had to re-learn. i had lost most of the ability to ride a horse, play a guitar and after 10 years, i STILL dont remember my wedding day which was 3 days before the accident. anytime i get hit in the had increases the risk that i'd never come back from it, so the consussion was no joke in this case. however, i also wouldnt sue for something like this and i'd be perfectly happy to sign something saying so as other than the concussion and a little gouge in the bondo on the gas tank of the k4 no damage was done. IF i were injured permanently then i'd consider some sort of lawsuit but i wasnt so i didnt.