The feud between Olivia de Havilland and Bette Davis is one of the most famous in Hollywood history. The two actresses, who both starred in the movie The Witching Hour, were reportedly at each other's throats during the filming of the movie. There have been many stories about their feud, but the truth is that no one really knows what happened between them.
There are two main theories about why they didn't get along. The first theory is that de Havilland was jealous of Davis' success. Davis was a much bigger star than de Havilland at the time, and she may have felt like she was being upstaged by her co-star. The second theory is that Davis was simply difficult to work with. She was known for being a diva on set, and she may have made life difficult for everyone around her, including de Havilland.
Whatever the reason for their feud, it's clear that it affected their relationship on set. They reportedly refused to speak to each other when they weren't filming, and there were even rumors that they had to be filmed separately so that they wouldn't come to blows. However, despite all of the drama, they both gave great performances in The Witching Hour and proved that even Hollywood legends can sometimes put their differences aside for the sake of art.