Any time Wladimir Klitschko has been KO'd I have pretty much celebrated it as a national holiday.
lol

Mayorga beating Forrest the first time was great.

When James Toney broke down and stopped Vasiliy Jirov that was extremely satisfying to watch, especially since the HBO broadcast team was very pro-Jirov.

Recently when Maidana made Ortiz quit that was enjoyable to watch.