Knockouts. It's what we love as fight fans. Very rarely do you tune into an MMA fight and get pissed off because the fight ended in a KO. And if you do, what planet are you from? Get yourself checked out by a head doctor.
The same can go for other combat sports. Boxing and kickboxing both have their share of knockouts and the following video is an example of that. The fights where a fighter comes back from the brink of destruction to finish their opponent are the ones that stick in our memory.
This Muay Thai fighter was about to be another notch on his opponent's win column, but he then pulled a jumping kick out of his bag of tricks to cap off a tremendous comeback.