Off-Set Shade! Co-Stars Who Wanted to Kill Each Other When the Cameras Stopped Rolling

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The greatest movies and TV shows depend on the chemistry of the leads. Right? Whether it's a love thing or platonic, the vibe between the costars can make or break a viewing experience. The funny thing is, even in shows and films where the chemistry is working -- where the actors are giddily smiling in each others' faces, making out, having wild sex, or cracking wise -- this has zero bearing on whether or not the actors like each other when the cameras stop rolling (and in some cases, a visceral hatred of each other can produce onscreen magic!). For every Ashton Ku

Did you know that the two funniest Golden Girls, Bea Arthur and Bette White, were at each other's throats for the entire series? Just goes to show you that, for every Ashton Kutcher and Mila Kunis -- That 70s Show castmates who ended up being soul mates -- there's a couple of co-stars each plotting the other's demise the second the curtains close.

Here, our twenty favorite co-stars who actually hated each other!

[Photos: Getty Images, The WB, Columbia Pictures]