I once worked at a campground that had an old dump truck with and old flat. Nobody had been able to get the lug nuts off to get the tire fixed. Not being one to turn down a challenge I decided I'd remedy the situation.
Put the lug wrench on and wouldn't budge. Used a 6 point with a break bar. No luck. Finally put an 8' pipe on the breaker bar and snapped the stud clean off. Tried another and did the same thing. Finally picked up one of the broken stud/nuts and the nut spun off easy by hand.
Looked a little closer and noticed the left handed threads. I was going to be mean and replace the every other stud with right hands and every other with left hands but decided to just replace them all with right handers.