You mean all this time we could have been friends?

The NFT is doing a Bette Davis special and yesterday I went to see Whatever happened to Baby Jane?
Bette Davis and Joan Crawford who hated each other by then play the bad and good sister in a film that according to Wikipedia started 'a trend of movies featuring older women in peril, or on the brink of insanity'.

The movie tells the story of middle aged (Baby) Jane [Bette Davis] and Blanche Hudson [Joan Crawford], two sisters that had been famous during their youth but whose lives become sour after Blanche's car accident left her in a wheelchair and at Jane's care.

Directed by Robert Aldrich, he made sure the actresses were aware of the importance of the movie to their careers (they were nearing 60 by then) and it's reported that despite their mutual hate, they worked in a very professional but tense atmosphere and they surely show that on the movie - you sometimes think that Bette Davis would be taking a lot of pleasure when she is being rough to Joan Crawford.
When Bette Davis was nominated for an Oscar though, Crawford campaigned against her. Davis was also nominated for a Golden Globe award and for a BAFTA for the movie.

Click on the link to read the Wikipedia article on Whatever Happened To Baby Jane?
I also recommend searching for Bette Davis and Joan Crawford for an exhaustive life story.