I think this one has been said before in another thread, but...
What if Stephan Bonnar had beaten Forest Griffen on the first TUF finale?
What would have happened to the sport of MMA then? (I don't remember who Forest went on to face next after that, but I'm sure things would be a lot different). Beating Shogun and then beating Rampage for the title? I don't think Bonnar would have even come close.