A famous trainer(forgot who) once said when Tyson hit sparring partners to the body it sounded like someone hitting a phonebook with a baseball bat.
I saw Wlad-Peter live and every right hand Wlad threw you could hear in the entire arena. It was like a giant clapped. I was amazed that Peter could take those shots.
actually, the punch at the very beginning that drops zertuche sounds nasty but zertuche actually gets up from it. the one that puts him to sleep on his feet you can't really hear. i know there is vids out there that you can, but i can't find it. either way...the first kd is seconds into the vid and you can hear it pretty good. [ame]http://www.youtube.com/watch?v=HchCpnORAqk[/ame]
It's not the nastiest sounding punch but that left hook Tua landed on Ruiz's chin as he was falling unconcious was plain nasty
I remember someone writing that McClellan's punches in the Benn fight sounded like a baseball bat pounding a dead animal carcass.