Need help naming a Joan crawford film

[loyal1]

I just watched serial Mom again the other night and a friend and saw a scene when the son and Birdie were watching a film  that shows a scene of Joan Crawford axing people to death in their bed.  you see a shadow of the head rolling off the bed and then she still continues to chop...great stuff!

My friend and I want to rent it but do not know the name of it...can anyone help?

[Yaddo42]

That would be the 1964 William Castle film "Strait-Jacket".