So your first movie was a hit! Somehow you even managed to nail the sequel and expand on your characters... so you have to make a third now, right? In mathematics, religion, writing, and yes, art, the number three resonates with its user. Pythagoras reasoned it was the perfect number as it could chart a beginning, a middle, and an end. In Latin the phrase goes "omne trium perfectum," stating that every three is perfect, or every set of three signifies completion. Through history and the wiring of our brains, we are here to seek out patterns, and the number three is the smallest (and therefore easiest) one to find, but in the film world the 'Part 3' is so often overlooked for its efforts. This list of the best third movies in film series is by no means here to state that these films are better than the originals (although some arguably are), but rather just fantastic additions that are an often overlooked part of a trilogy. There is a lot of weight on a trilogy closer, or "threequel" if...