Bad Chemistry: The 10 Most Hilariously Unconvincing Movie Couples

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Movie couple chemistry is everything. A film could have an abominable script, be shot terribly, and have the dumbest trailer ever, but if we believe that the onscreen duo actually wants to rip each other's clothes off, it's a hit. Sadly, no amounting of perfect casting can predict whether or not a pairing will work. Who's sexier than Brad Pitt and Catherine Zeta Jones? And yet, in Oceans Twelve, they behaved like they were just meeting after a few awkward texts on Tinder. And what about Natalie Portman and Hayden Christiansen in the Star Wars series? Their relationship was supposed to be so epic that it begat Luke and Leia -- but the duo was so sexless that you almost believed their kids came into the world via immaculate conception. And we won't even get into the wasted beauty that was Beyonce and Idris Elba in Obsessed...

Here, the ten terrible movie couples we love to hate.

[Photos: 20th Century Fox, Warner Bros., Fox Searchlight]