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The original was posted on /r/todayilearned by /u/shylildonut on 2023-08-04 08:34:07.

Original Title: TIL the term “gaslighting” originates in a British play-turned film from the 1930s. The play was called “Gas Light” and the plot is about a husband who mentally and emotionally manipulates his wife into believing she is crazy by changing the intensity of the gas lamps within their home.