I think it was Tito-Ken I. I remember being so excited to see what would happen when these guys clashed. The intro for that event is one of the best to this day.
http://youtu.be/v7jzZMVw9tk 
Pretty cool to look back on. I started watching some time after this, maybe a year and a half. 
Lennox Lewis vs. Hasim Rahman 2.
GSP-Penn 2 and Sonnen-Silva 1 come to mind.
UFC 40 was amazing hype.
I could not wait for that event. It worked so well I even started thinking Ken had a shot.
I remember being HYPED for Chuck/Randy
Rashad vs. Rampage for me. And even though it never materialized I was so hyped for Condit vs. MacDonald 2.
weidman vs silva 2
GarlicSenior - Rashad vs. Rampage for me. And even though it never materialized I was so hyped for Condit vs. MacDonald 2.Lol.
Fedor CC, Tito Chuck, Saku Royce and Renzo, Andy Chael 2.....
Tito Ken too yeah
Chael vs Silva I was great, just the over the top way chael was trying to sell the fight was really entertaining and it got me thinking that maybe he had a chance
Brock vs reem, gsp vs diaz
As a huge GSP fan, BJ vs GSP and Diaz vs GSP. I was psyched beyond belief for those two.
Shad/ Jones
Shad/ Rampage
Anderson/ Chael 2
Anderson/ Weidman 2
GSP/ Penn 2
Sonnen vs Anderson
FTUGTT_Mix6APlix - Fedor v Crocop
This.
Jacob Volkmann vs Antonio Mckee changed my life
CowboysStuntDouble - Chael vs Silva I was great, just the over the top way chael was trying to sell the fight was really entertaining and it got me thinking that maybe he had a chance
Was over the top but EVERYONE was into it and both sides were pretty pumped, i know i was. As was i when the fight started. IMO, it was clear that Andy's performance in the first fight was due to his hibs but that wasnt evident until the 2nd fight ended. Also, Chael beat Marquart and Okami leading into the first Andy fight then Bisping and Stann. He was the #2 MW legit during that period.
