Every male, at some point in their life, has watched some kung fu badass beat up a room full of bad guys and said, "I want to learn that!"
Unfortunately, some of the martial arts you've fantasized about don't even exist in the real world. Why? Because they're too awesome. For instance:
Gun Kata (Equilibrium)
This incredibly kick-ass way to kick ass with a dumb-ass name (that's three asses!) first appeared in the movie Equilibrium where Christian Bale uses it to kill pretty much everyone. From there it's shown up in way too many, ridiculously awful fan videos, and a few that are surprisingly cool, inspired some genuine martial artists to do their own choreographed performances of the style, and depending on which rabid fanboys you talk to, may or may not have appeared in director Kurt Wimmer's spiritual sequel/suckfest Ultraviolet.
According to the movie:
"Through analysis of thousands of recorded gunfights, the Cleric has determined that the geometric distribution of antagonists in any gun battle is a statistically-predictable element. The Gun Kata treats the gun as a total weapon, each fluid position representing a maximum kill zone, inflicting maximum damage on the maximum number of opponents, while keeping the defender clear of the statistically-traditional trajectories of return fire. By the rote mastery of this art, your firing efficiency will rise by no less than 120 percent."
Allow us to translate:
"Treats the gun as a total weapon." You can shoot people with your gun and pistol whip them with it.
"Maximum kill zone/damage/number of opponents." You shoot a lot of people.
"Keeps the defender clear." Nobody can touch you.
"Rote mastery of this art." It works entirely on the principle of cool poses.
See it in action:
Allow us to repeat that last part: this martial art works by cool poses. Seriously.
But would it actually work?
In the vast majority of cases where people survive gun fights (note the avoidance of the word "win") they do so not by dodging shots but by taking cover. The concept of "statistically-traditional trajectories of return fire" is laughable. That said ...
There are quite a few martial artists out there who've created something like the gun kata, including former ILF fighter M.A. Sotelo's Juu Kun Do. Or check out this actual karate class, where they're learning the technique. It's best not to show up on live ammo day.