The best gag in Dumb And Dumber To arrives around the midway mark, when aging idiots Lloyd Christmas (Jim Carrey) and Harry Dunne (Jeff Daniels) have an unexpected blast from the past. There in front of them, in all its ragged canine glory, is the ’84 sheepdog they traded, straight up, on their 1994 odyssey to Aspen. Twenty years have elapsed, on-screen and off, since these brain-dead besties last saw their beloved shaggin’ wagon, and there’s something undeniably rousing about the sight of the two men careening down the open road again in the custom-designed vehicle, hair (and fur) to the wind. And then they go over a steep hill, the van lands with a spectacular thud, and the engine shorts. No more shaggin’ wagon. Nostalgia trip over.