But for most cases, they're simply the most stunning sights an MMA fan can hope to catch. With that in mind, this list covers five of the greatest head-kick knockouts in UFC history.

In his most recent video, he sets out to try and determine once and for all which style of kick is the most powerful, using a punctilious set of "highly scientific," completely not-made-up criteria.

Without doubt the most famous of our powerful free-kick takers, Roberto Carlos is just one of a many Brazilian players to have developed a rocket-like shot from set-piece opportunities.

Takedowns are just paying rent. So with an emphasis on striking, but with a nod toward grappling and sheer physical strength, presented herewith are the 25 most powerful fighters of ALLLLLL time.