Thanks for looking!
So I can't remember much about this film other than it was in b/w so I'm assuming it's an old thriller, basically there's a scene where this man is talking with a woman and she mentions the phrase 'cleaning lady' or something similar and that sends the man into a rage and he starts to strangle her. He stops for some reason and then explains to her that he always flies into murderous rage at the sound of 'cleaning lady' since his father had an affair with their maid/cleaning lady when the man was a boy.
Then later in the film, the man and the previous woman are talking to (what I'm assuming to be) a dangerous man, the 'bad guy' if you like, and the woman whispers something to the bad guy and he grins and says "she just told me she would be my cleaning lady" so the man responds by killing him. Thus the bad guy is dead.
I watched this film as a child and cannot for the life of me remember what it's called, thank for you any help you guys may have!