I'd rank the St. Louis free throw meltdown in the tourney as particularly painful. Admittedly I'm a UNC fan, but tend to pull for State in the tourney (because I'm weird). It was a slow, methodolical, torturous loss. The fact it was done using a strategy similar to what Valvano used on teams during the '83 title run just made it that much more awful.
In fact, that game reminds me a little of this storm. Big lead for awhile, and then a slow but deliberate trend of the warm nose making a comeback. You saw it coming, but you didn't want to believe it. But deep down, you knew it probably would.