I think I saw Robbie Lawler vs. Rory MacDonald for the title when I was tripping on LSD - that was incredible. And then next up Conor McGregor vs. Chad Mendes and they had the live performances to introduce them - wow that whole card was amazing.
The most I've ever been blown away from a sporting event would have to be Rafael Nadal vs. Novak Djokovic for the Australian Open 2012. Then Ravens/Broncos 2013 playoffs. Then Ravens/Browns on MNF a couple years ago, 2020... Lamar was out for like an hour and a half and then comes back on the field to play with 2 minutes left and it's 4th down and he completes a pass to 'Hollywood' Brown for the TOUCHDOWN! To save our season and playoff hopes. I was only on 100ug LSD but it was incredible. That was amazing.
Shogun/Jones still hurts to this day. CroCop/Randleman isn't quite as bad but it was shocking when it happened.