Get a mate to look really pissed off and to come towards you with pliers within a confined space.
Place a pair of pliers on your forearm, neck or anywhere else and gently squeeze then post back...
You'll want to disengage and get away! A punch to the skull/head feels like a dull-thud doesn't it. This doesn't.
Again all hypothetical. I've never been in trouble with the law and I've no intention of.