ok i was going to put on the new wheels on my car on the w/e when i came across a wheel nut on the back passenger side wheel that is completley stuff, one side of it is nearly round instead of the hexagon shape, after deciding that its pretty much stuffed anyway we got the rattle gun onto it but had no luck with that, it just keeps slipping. These wheel nuts were done up that tight anyway that we bent the crap out of the bar that comes with the car to an unuseable point.

how the hell do you get it off?? im sure workshops etc would come across this from time to time.