Tszyu vs Judah - Judah talked a lot of **** pre-fight. He talking about how he's the P4P #1 fighter in the world. Unbeatable superman. Tszyu knocked him out in 2 rounds and then he attacked the ref and got himself suspended for a year. Maussa vs Harris - Harris said he was the best fighter at 147 and would beat Mayweather, only to get knocked out by Gollum.
I'd say Hamed vs Barrera. This is probably the first time Hamed met a real elite opponent as worthy as a title unification match. But Hamed acted stupidly prior to the fight. Like the way he entered the ring using circus-like string hangimg device. And went as far as having word "Islam" sewed to the behind of his trunk, making this fight some sort of war of religion. He even made special request so Buffer gave him the mic to recite Quran verses before fight. Later, Barrera eventually dismantled and humiliated him. I watched the fight with several muslim friends and they all felt so embarassed at that time, and despised him ever since.