To open our second annualBest Month Ever — in which we'll be naming the best in a new category every weekday of August — Calum Marsh has a list of the 20 best movie sequels. They defy the law of diminishing returns (and Hollywood franchise fatigue). And some of the choices — from the silent era on up to Terminator 2 to Michael Bay to the new era of 3D — might surprise you. Go ahead and fight it out in the comments.