I first learned about gaslighting in an Archie comic, of all things.
Archie and Jughead had just finished watching the movie, and then Jughead , being the woman-hater he is, told Archie it was easy for a man to make a woman think she was losing her mind because "He was a man! She was just a dumb ol' woman." Archie reasons that women are not dumb (good for him), but then suddenly remembers he was supposed be going on on a date with Veronica, but was so into the movie he had forgotten about it. Veronica then shows up and she is very slightly peeved, but then Jughead tries the gaslighting thing on her by pretending he's Archie and that Archie is Jughead. It actually seems to be working, so Archie decides to just play along rather than be in trouble with Ronnie. Jughead, playing as Archie, asks Veronica is she's feeling all right because she's supposedly getting them mixed up, and has she been getting a lot of headaches and worrying. Veronica says she has, and asks if she's been acting "strangely". But then the gaslighting game ends abruptly when Veronica tries to hug and kiss Jughead, who goes right back to being himself and runs away. Then Veronica mentions to Archie that she had been watching Gaslight too, while she was being stood up by him. 