Bradlab

There was a movie about two women who become best friends and talk about everything in their lives. One day, the conversation goes to their husbands and how much they get annoyed by them. They then state how much they would like to kill them. One of the women says that if she kills her friend's husband, then her friend must kill hers. The other woman says it's a deal, but, only meant it as a joke. The other woman then actually kills her friend's husband and now demands that she follow up on her "promise." I believe this was a Lifetime movie.