Actually this may seem funny, but I saw a bit of Mel Gibson's Riggs from Lethal Weapon in specific scenes. The whole talking to himself bit when he was angry or amused, stuff like "Come on hit me, hit me, I want you to do it!", and when he was walking out of the hospital playing with the detonator. In both those scenes he moved liked Gibson, and both his quirkiness and delivery were very similar to Rigg's incoherent ramblings when he was pissed! It would make sense considering one of his first major breakout roles was playing Mel Gibson's son in The Patriot, where he would have had plenty of time spent around the man watching him work. Not to mention, if you've ever seen Gibson in an interview the guy is full of nervous manic energy, he's very twitchy and a little spastic!