knock somebody down?

I started thinking about this topic because I just rewatched Hopkins/Trinidad.

I"m sure most people remember the fight but at the very end of the tenth round, best round of the fight, Bernard and Tito were shoulder to shoulder and Bernard threw a right to the body and a beautiful right uppercut, wobbled Tito badly. Im sure most people remember the punch, Tito did a little dance, but didn't go down, and the round ended.

Beautiful punch, not by any means the hardest punch of all time but a beautiful punch.

So I was just wondering what was the best punch you've seen that didn't drop or stop an opponent?