Inspired by this Reddit thread.
If you watch the Lord of the Ring trilogy backwards, it's a saga about a little guy who gets a cool ring from a volcano and spends the rest of the films walking home.
If you watch Fight Club backwards, it's about a terrorist schizophrenic getting his life back together and going to rehab.
If you watch Batman Begins backwards, it's about a lunatic who prances around in a bat suit till he's cured by being trapped in a well with hundreds of bats.