Which film has the most important distinction between the standard of the trailer and the completed movie?

Good trailers are an artwork type. For each "Jurassic Park" the place the trailer will get you hyped and exhibits juuuuust sufficient to get you hooked, there's one thing like "After Earth," which has a reasonably good trailer and was a dogshit film.

Simply curious in case you have a very horrible trailer for a terrific movie or vice versa.