[arthurus]

That is directly from the movie. Manipulation of the gas lights in the house for the husband to convince the wife she was losing her grip on reality.

[Political Junkie Too]

Actually, in the movie he wasn't intentionally manipulating the gaslight to make his wife go crazy. He told her he was going out but was secretly in the attic looking for lost jewelry, and the house lights dimmed when he turned on the gaslight in the attic.

He only told her she was imagining the lights dimming and then started making up new things like forgetting the mail or losing something to throw her off from inquiring further about the gaslights dimming.

-PJ