I’ve seen many of the movies commented on in this thread but bookmarking for others I haven’t for Netflix.
Gaslight is one I DVR’d this morning actually. It is not my favorite movie of all time, but I do like it, and most of my friends have never heard of it.
While you are at it, try a movie called “No Mans Land” It is a very black comedy about the Bosinian war and how the UN is useless.