As it happens, the very term "gaslighting" comes from a film (two films, actually). British director Thorold Dickinson's 1940 version and George Cukor's more famous 1944 version of "Gaslight" involve a conniving criminal who tries to convince his new bride that she has gone insane in a ruthless attempt to get her committed, giving him power of attorney over her and her ancestral home, which, he's convinced, holds a secret treasure. His primary tactic is to set things astray, perhaps a picture frame, or an antique glass bottle, intentionally hiding her possessions, and convincing her that she's the one who made the mistake.