First film to use the T word?
I've sometimes heard that X was the first film to say "*beep*" or X was the first film to use *beep*
As "twat" is largely confined to Britain, I've never heard what the first film was to say it. I bet that it was probably in Kes though, where it is said in the opening scene. Jud says to Billy, "They wouldn't have a weedy little twat like thee."
This line appears in the novel as well. There was a considerable amount of profanity in the novel that was cut out of the film.