George Cukor's 1944 film Gaslight (Charles Boyer and Ingrid Bergman) is the only film I'm aware of that coined a psychological term. Sometimes I feel "gaslighting" is another name for American politics. Consider this definition from Urban Dictionary:
"A form of intimidation or psychological abuse, sometimes called Ambient Abuse, where false information is presented to the victim, making them doubt their own memory, perception and quite often, their sanity. The classic example of gaslighting is to switch something around on someone that you know they're sure to notice, but then deny knowing anything about it, and to explain that they 'must be imagining things' when they challenge these changes.
"A more psychological definition of gaslighting is 'an increasing frequency of systematically withholding factual information from, and/or providing false information to, the victim -- having the gradual effect of making them anxious, confused, and less able to trust their own memory and perception."'