I once helped to restrain a shoplifter who was nicking transistor radios from a toy shop. The elderly woman cashier had spotted him and was pulling radios out of his very large coat pockets. He was pushing her around and acting up so I grabbed his arms and held him. Then his mate turned up, having gone back to unload his pockets.... as they left the first one threw a punch at me, which I dodged but his knuckle connected with a very weak crown I had and knocked it out (did me a favour really because the tooth was rotting and tasting awful). Police came and we searched the nearby shops for them but no sign. Shop owner gave me a fiver.