Loosely related to unexpected word origins, I didn't know until recently that when "gaslighting" someone, you're using an expression tied to literal gaslights from a 1944 movie. I'm likely late to the party on learning this origin.
That was Angela Lansbury's first movie, as well. It's a quote decent film.
Yes; I watched the movie "Gaslight" recently, and the meaning that everyone uses has drifted pretty far from the movie's meaning. But it's probably hopeless to resist a meaning when it becomes trendy.