3. Dredd (2012)
Hardcore fans of the 2000ad and Judge Dredd comic books will already be familiar with how a Judge's Lawgiver pistol operates. It is uniquely coded to the fingerprints of an individual meaning that if at any point a Judge is disarmed his attacker cannot use his own weapon against him. In the 2012 reboot of the cult classic franchise this exact moment is recreated when Psi Judge Anderson finds herself staring down the barrel of her very own gun. For a moment she toys with her attacker allowing him to think he actually has a chance of taking her out. And then, as his finger slowly begins to squeeze the trigger the gun's fail safe is triggered and the weapon explodes removing the assailants hand and arm in the process. It's one messy moment but looks perfectly normal in the dystopian world that the characters of the movie inhabit. http://www.youtube.com/watch?v=9YO8_lLLcJM Dredd wasn't the first film to use the exploding gun technique to remove someone's arm but it's no surprise that this is the most realistically violent example in the history of film and mercifully refrains from straying into the ridiculous or over the top territory of most low brow horrors and fantasy movies.