Danny williams when he knocked a guy out after dislocating his shoulder. Forgot the other guys name. Castro is a good one
Mickey Bey-John Molina is what immediately came into my head when I saw the thread title but its been mentioned. Hank Lundy-John Molina Dmitry Pirog-Danny Jacobs JCC Jr.- Andy Lee
Lee is the master of come from behind KO's, or getting KO'd JCC Jr vs Lee Vera vs Lee I Lee vs Jackson Lee vs McEwan Lee vs Korobov
Gatti v Rodriguez. I think Gatti was down before knocking out Ruelas too - he was definitely saved by the bell and in severe trouble before pulling out the ko.
Shannon Briggs vs Siarhei Liakhovich , Bernstein had Liakhovich up by a couple of points going into the last round. I would've also said Maskeav/Rahman but I think Maskaev was up on the scorecards on two judges.