I was trying to remove the bolts on rusty diff cover. It was removed from the Jeep, so I had more than enought "angle of attack". Pull...seized...spray PB blaster...pull...nothing...sprayed more and waited until the next night...nothing. Got a bigger wrench and pulled harder. The head snapped off of the bolt, and ended up slicing 2" right below my goggles. I was lucky! I didn't notice the blood until I saw a drip on my shirt. Wiped my face, and it looked like a chainsaw massacre I guess safety goggles are the moral of the story, because we can't be outlawing rusty bolts!