Fedors' was pretty surprising, Everyone thought his first loss was a fluke, then went ahead and strung along 2 more.
I wouldnt call chucks surprising, He left his chin out for anyone to hit and it was only a matter of time before it gave out.
Branden Vera 
Chuck,
takes out Tito, then...
Roger Huerta
Jake Shields
Jake sheilds
Tyson griffin
Brock
iono if shields counts yet, he lost to GSP then fought a few after losing his dad, then rebunded
Tyson Griffin.
Arlovski, he has the talent, but doesn't seem to be able to take a punch. He could have been a beast if he had the chin.
Mark Kerr
Kevin Randleman
Both looked unstoppable in the beginning. Randleman would have moments of brilliance even after he "fell off", (first Cro Cop fight)... while Kerr never quite reached the potential many of us saw.
There are others.
But the more fighters I have followed, the less surprised I am.
Choir Boy - Tyson Griffin. <img src="/images/phone/apple.png" alt="Phone Post" border="0" style="vertical-align:middle;"/>
good one
Mark Kerr
Sotiropoulos.
Joe daddy
Cro Cop
Karo parysian
As difficult as it is for me to say it, Crocop's UFC career was quite a shocking disappointment.
Michelle Lopez
A lot of people seem to be confusing the word "fall" for "fail" -- the OP refers to the latter.
Anyway, I'd throw Sokoudjou's name in the hat. He never really had a dominant period, so he might actually be closer to fail than fall, but damn... It seemed like his win over Rogerio might have been a fluke, but when he took out Arona it looked like he might have been the real deal. He still has occasional flashes of brilliance even in his losses, and it seems like he has the physical tools it takes to be a better fighter, but he just folds too easily. Maybe he surged too high too fast, or maybe his head just wasn't quite right. Either way, it's too bad.
Karo, Gonzaga, and Lesnar.
itswhitty - A lot of people seem to be confusing the word "fall" for "fail" -- the OP refers to the latter.How can u say he means fail when it says fall in the title. Plus his 2 examples are clearly guys who had a falling off, but definitely not a fail.
Anyway, I'd throw Sokoudjou's name in the hat. He never really had a dominant period, so he might actually be closer to fail than fall, but damn... It seemed like his win over Rogerio might have been a fluke, but when he took out Arona it looked like he might have been the real deal. He still has occasional flashes of brilliance even in his losses, and it seems like he has the physical tools it takes to be a better fighter, but he just folds too easily. Maybe he surged too high too fast, or maybe his head just wasn't quite right. Either way, it's too bad.
Gonzaga is the one.
Good at everything,but kinda cant fight.
TheBoognish -itswhitty - A lot of people seem to be confusing the word "fall" for "fail" -- the OP refers to the latter.How can u say he means fail when it says fall in the title. Plus his 2 examples are clearly guys who had a falling off, but definitely not a fail. <img src="/images/phone/apple.png" alt="Phone Post" border="0" style="vertical-align:middle;"/>
Anyway, I'd throw Sokoudjou's name in the hat. He never really had a dominant period, so he might actually be closer to fail than fall, but damn... It seemed like his win over Rogerio might have been a fluke, but when he took out Arona it looked like he might have been the real deal. He still has occasional flashes of brilliance even in his losses, and it seems like he has the physical tools it takes to be a better fighter, but he just folds too easily. Maybe he surged too high too fast, or maybe his head just wasn't quite right. Either way, it's too bad.
man... lol