Way back when, rabbit shots were perfectly legal. When I was 10 or 11, a guy I knew that had fought 'when he was young' (as he was 76 in 1974, I'm guessing he fought in 1920, roughly), showed me how he got his nose smashed all over his face. The guy caught my friend's left elbow with his left hand and turned him- as they twisted, if I'm making sense, he backhanded him.
This fight was VERY dirty, and the ref DQ'd Mateen.