Seen it too many times. The biggest guy on the team grabs the biggest wrench he can find for the smallest fastener on the assembly. Maybe the wrench bends, maybe the head snaps, I've seriously considered getting torque limited Allan wrenches.
I recently had someone complain about a bolt getting hot while they were wrenching it. they created enough friction to notice it heating up. and then kept wrenching it.
also, I've started replacing normal bolts with rounded hand-bolts, which are nearly impossible to over-torque, so long as they don't take a pair of pliers to them.