What makes a monster hit special?
Is it how loud the sound is from the collision? Is it how far the victim flies after he gets jacked up? Or is it who is getting hit (e.g., it's more fun to watch Reggie Bush get hammered than some no-name)?
Those three criteria all play a part, but when the person hit is actually knocked unconscious, it takes the act to another level—the lights are literately knocked out.
Here are the best knockouts in sports history.