Any cheap shot on the field that leads to (or has the potential to lead to) an injury (think Jack Tatum, think Brad Butler in college, etc).
Now of course, it has been revised to something like "Most classless act while gloating in victory". I don't real feel like spending time thinking of any post game altercations, threats, coach backstabbing, players blaming one another, etc. It isn't worth my time. Plus, I'm convinced that if I go to the trouble of recalling these other acts, then the claim will be further revised to something like, "Most classless non-violent act by a coach while gloating in victory" and finally "Most classless act against a box of cereal while gloating in victory." BTW, I can live with that last one.
Once again, it was a BOX OF CEREAL. That alone should exempt it from being called most classless, as many very classless things have occurred in sports.
Now, PLEASE, stop making it seem like I'm defending that scum bag Jimmy Johnson. I have to freakin' take a shower every time I post in this thread.
EDIT: The difference between TO's antics (like the star) and JJ's stomping of cereal is TO has a knack of actually being funny.