Kryptonite!
I must admit that I am still stunned about George Mason advancing to the Sweet Sixteen. And beating two teams from last year's Final Four in the process. And playing Wichita State--who we beat just a few weeks ago on Bracket Buster Saturday in Wichita. GMU did a pretty good job holding Paul Miller in check in that game, which turned out to be a good preview of what GMU did against Davis and Hansbrough this weekend.
On a related subject, Trent McBride has another great post with more data on the performance of mid-majors in the tournament. (I linked his earlier post this weekend here).