Well ive never been KO'd in a Set fight but ive been knocked out once at a party caught me right in the jaw (before i actually started MMA). Flyingknee's accurate with what he said, i've been rocked a 3 times in MMA (2 in fights, 1 in sparring).
The best way i can put it is its like you were spun around about 30 times with your eyes closed and then you opened them and someone pushed you. I also got SUPER tunnel vision, like it felt like i was looking out of each eye individually.
Anyways it really isn't fun but its part of the sport.
What is it that is going to be on your mind when you're on your death bed? Will it be the tedious years of 9 to 5, or the memory of some great acheivement. Maybe a moment you stood in glory to the applause of millions.