Probably the Friday The 13th series. My favorite in that series has gotta be Part 6. Jason Voorhees is probably one of the most bad-ass movie villains of all time, because for one, he'll use anything he finds as a weapon. He also doesn't need to say a damn word to strike fear in the hearts of his victims; his hockey mask, alone, as well as the victims he leaves behind, do that job pretty damn well.