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Tmac's was because he had a knee that had no cartlige in it. It happens to everyone big and small. Yao used to get blocked by the rim regulary.
Don't forget Von Wafer <iframe width="420" height="315" src="http://www.youtube.com/embed/eIFwBPvc6_0" frameborder="0" allowfullscreen></iframe>
At least he didn't miss after a running start, bad gather step. Less bounce in his step probably contributed though.
Getting rejected by the rim a la World Peace, Tmac, Big Baby, and now JRich is not the same thing as missing dunks. I don't remember a single time when Yao was actually rejected by the rim in the sense that the ball didn't cross the front of the iron.
I was going to say this is worse than tmac's...but tmac had a flat tire, Jrich just didn't time it correctly, but damn he fell on his ass hard lol...
To be fair, this dunk attempt by Richardson is almost straight vertical, much harder to get height as opposed to running into the attempt like T-Mac's miss. Still hilariously bad though.