It's like every action movie ever has a moment like this: The main character realizes that he's in a desperate situation, and instead of running, he decides to fight back in the most badass way possible. Sunglasses may or may not be involved. There are generally explosions, some crazy flips in the air with a car or two, and a stunt that makes the liability lawyers wince at the thought of anyone reenacting it.
What's your best "moment of cool"? My favorite one of memory was the time that I was flagged coming out of a BG in Un'Goro, and a paladin three levels above me decided to take advantage of that. After a few kills, I kited him over to one of the elite Devilsaurs, aggroed it, waited until he threw his shield and it hit me and the dragon, and Feigned Death. Then with the Devilsaur eating chunks of his health bar, I proceeded to finish the paladin off.
What about you? Everyone has to have one.