There is something breathtaking about a knockout kick. A well timed kick makes a haymaker look easy in comparison. Why do you think HBK used the sweet chin music for so many years in the WWE? Here is a compilation video of some spectacular thai kickboxing knockouts. Some of them are pretty brutal.
http://www.youtube.com/watch?feature=player_embedded&v=YviTFL5F9i0
h/t reddit