Bruce Willis first came on the scene when he played David Addison in the popular 1980s TV series "Moonlighting." Opposite him was Cybill Shepherd, who played his love interest Maddie Hayes. Their on-screen sexual tension had fans rooting for them to get together, making them an early purveyor of the popular "will-they-won't-they" romance trope, according to Nine Network. But their offscreen chemistry was a different story, and according to co-star Curtis Armstrong, the two actors couldn't stand each other. Body doubles were used so they wouldn't have to be near each other, and they couldn't bear to make eye contact.

Shepherd's pregnancy made tensions worse, since the schedule was shifted to accommodate her, and Willis was forced to work longer hours. When the pair had to film a scene that featured an argument between their characters, it devolved into an actual argument. 

The cause of their feud remains a mystery. Armstrong said in his book "Revenge of the Nerd" that Willis once divulged a mistake in his early relationship with Shepherd, which Armstrong interpreted as a sexual liaison. Additionally, Willis' fame ballooned four seasons into the series with the release of "Die Hard," which may have hampered his relationship with Shepherd. Shepherd would later joke about their strained relationship in Willis' comedy central roast, noting that the two hadn't spoken to each other in 30 years, per Nine Network.

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