12 TV Couples Who Absolutely Hated Each Other In Real Life

Mila Kunis and Ashton Kutcher are happily married now, but their relationship wasn't always so sunny. When they met on the set of That '70s Show, where they portrayed Jackie and Kelso, the two actors couldn't stand one another. For all their scenes, Kunis and Kutcher had to pretend to really like each other when they actually despised one another. 

It could be chalked up to a maturity issue or even a generation gap: Kunis was just 15 when That '70s Show started, and Kutcher was 20. Costars were a bit surprised the two ended up together in real life, and Kutcher even became Kunis's first kiss - in character as Kelso and Jackie, of course.

The stars of Castle were once said to "completely despise each other." Rumor has it that Stana Katic, who played Kate Beckett, and Nathan Fillion, who played Richard Castle, refused to speak to one another when they were not in front of the camera. But things on the set apparently got so bad that Katic was breaking down in tears because of Fillion's behavior, and producers forced the two actors into actual couples counseling.

Both actors have handled the reputed discord with professionalism: Katic has never publicly acknowledged any tension between Fillion and herself, and Fillion has tweeted his support of Katic.

Stars Hollow's favorite couple, Lorelai (Lauren Graham) and Luke (Scott Patterson), may not have been as star-crossed as viewers hoped. Though both Graham and Patterson have worked hard to deny any friction between them, rumors persist that the two Gilmore Girls stars weren't exactly the best of friends. Or friends at all, really.

When asked in an interview if she and Patterson were friends off the set, Graham replied with what appeared to be an emphatic, "No." The two did post an all-smiles selfie when Gilmore Girls wrapped its new batch of episodes, but were they just happy because they didn't have to see each other anymore? Fans may never know.

Not the much-loved Scully and Mulder?!? Yes, it's true. Gillian Anderson and David Duchovny of The X-Files have kept the truth out there: as co-workers, they've had their share of ups and downs. "There were periods when we hated each other," said Anderson, who, tellingly, neglected to thank her co-star in her Emmy acceptance speech. Duchovny has also confirmed the two had no real relationship off the set.

It's also important to point out that both appear to have been professional despite their differences, and they continue to work together in various X-Files incarnations in the 21st century. According to Duchovny, they now "have a successful working relationship and that’s the best way to go about this job."

Perhaps the most famous and beloved TV couple sidekicks in history, I Love Lucy's Fred (William Frawley) and Ethel Mertz (Vivian Vance) were arguably just as popular as Lucy and Ricky Ricardo. But Frawley and Vance detested one another.

It all started when Vance, who was 22 years younger than Frawley, started voicing her displeasure about their age difference ("No one will believe I'm married to that old coot!"), and about Frawley being mean and crotchety. And by all accounts, he was something of a crank, saying Vance looked like "an old sack of doorknobs."

Years later, Vance was dining at a restaurant when she heard Frawley had died. She ordered celebratory champagne for the entire place. Needless to say, the two never made peace, despite their pitch-perfect chemistry and comedic timing.

During the first three seasons of the classic sitcom Make Room for Daddy, Danny Thomas's character, Danny Williams, was married to Jean Hagen's character, Margaret. Plotlines often revolved around Margaret managing the household and raising the kids while Danny was out earning a living to support the family. At the time, it was a novel concept that proved successful, due in no small part to Thomas and Hagen's chemistry.

Yet not everything was perfect in classic-sitcom land. Thomas and Hagen reportedly clashed on the set and didn't care that much for one another. Hagen tired of the show and of Thomas, and left at the end of the third season. Thomas was apparently so incensed at her leaving that he demanded the writers kill off the character.