For me, it was quite the opposite - when I saw Casablanca for the first time, I remembered all the scenes from it being parodied or quoted, and I thought, "so t

For me, it was quite the opposite - when I saw Casablanca for the first time, I remembered all the scenes from it being parodied or quoted, and I thought, "so that is where those came from". The same happened to me watching The Wizard of Oz. Suddenly I remembered all those scenes from the Simpsons which I did not get before and was like, "now I get it". There is an episode of Star Trek DS9 where a character almost literally quotes the speech at the end of The Third Man (given, incidentally, by Orson Welles). Had I not seen The Third Man, I would have thought it was just a stupid monologue, but knowing where it came from changed the tone and gravity of that scene completely.