We all love a good plot twist. From The Sixth Sense's amazing reveal of a perpetually dead Bruce Willis to The Usual Suspects's final incredulous villain, cinema is appreciated best when it makes you double take so hard that you're left picking your jaw up off the floor in the aftermath.
What these two movies in particular have in common though, as it should be noted, is that they're fantastic films regardless of whether a category five twister comes bounding in or not - but not every film has the pleasure of such solid conception.
There's plenty of plain old average movies out there that get by just fine as the humble ready salted crisps of the film world. Getting a good plot twist in one of these mediocre movies is perhaps even better then, since they catapult them to new, lofty heights in the process, transforming your average Joe into a technicolour Joseph in no time with one big shake up that turns the narrative on its head.
It's not often that one convention can save a whole movie, but these are the exceptions to expectation that are worth the watch. And of course, there's going to be some spoilers. Don't say I didn't warn you.