If you watch this film backwards...

If you watch Gojira backwards, it's about a chemical that brings a dinosaur and a man back to life and the dinosaur rebuilds Tokyo, but gets killed by a nuke.

If you watch Only God Forgives backwards, it's about a police chief with a magical sword that can sew up body parts and cuts.

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Here, if you have a milkshake, and I have a milkshake, and I have a straw. There it is, that's a straw, you see? You watching?. And my straw reaches acroooooooss the room, and starts to drink your milkshake... I... drink... your... milkshake!
-Daniel, There Will Be Blood

If you watch nearly every romantic comedy ever it's about two people who are in love and living happily together, then one of them acts like an idiot for 90 minutes or so and they break up at the end.

If you watch Grave of the Fireflies backwards it's not nearly as depressing.

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You will find that if you look for the light, you can often find it. But if you look for the dark, that is all you will ever see.
Iroh

If you watch Godzilla backwards, it's about a friendly monster who built a city then moon walked into the sea.

Someone already did that one.