Originally Posted by
Katchie 
Gaslighting...I've heard, or read, that a couple of times on here from others...I'm going to have to look that one up.
The name comes from a movie (Gaslight) from the 1940's (?) starring Ingrid Bergman as a wealthy heiress who marries a duplicitous man trying to convince her that she is crazy thereby gaining control of her wealth and perhaps convincing her to end her life. He messes with the gaslights (set in 1910s I think) in their house and claims to not have done it. She goes kind of crazy hearing things in the house and seeing the lights go on and off, while he tells her he sees nothing (he is actually doing it). I highly recommend the movie as I like her a lot and it successfully showcases that relationship dynamic.
A's do it with the following scenario:
"Were you drinking?"
"Ugh, no, of course not. Why do you always doubt me. Gosh, you must the one with the problem. If you loved me you would believe me."
"Oh. I must be wrong. What is wrong with me."