We knew that Mel Gibson would be playing an unconventional Santa Claus in the upcoming movie Fatman, but now that Saban Films has released a trailer for the indie movie, I'll be honest -- I didn't quite picture this. Fatman is a dark action comedy about a 12-year-old brat who receives a lump of coal in his stocking and decides to hire a highly-skilled assassin (Walton Goggins) to kill Santa Claus, whose "business" is in such decline that he's become a bitter, alcoholic has-been. But drunk or not, Santa is ready for this onslaught …