I just now remember some made for TV movie (90s) about a chick on killing spree, she goes to the trailer (or maybe big rig truck) of her daddy (who raped her of course) and he says something like “So you’re a whore now huh? I’m not surprised, well get in here”.
I think they are his parents, and he was dropped on the head.
I (mercifully) don’t remember that flick...
Yes - incest and head trauma. What a tool.