Yesterday I saw Double Indemnity (I've been waiting for that film for so long!) and the scene where Fred MacMurry's character is posing as the husband of Barbara Stanwyck's character (who has been killed) is walking through the train carriage, on the left there is a woman who is knitting away happily.
There is also a great dialogue sequence in that movie about knitting:
Phyllis: He has a lot on his mind. He doesn't seem to want to listen to anything except maybe a baseball game on the radio. Sometimes we sit here all evening and never say a word to each other. Walter: Sounds pretty dull. Phyllis: So I just sit and knit. Walter: Is that what you married him for? Phyllis: Maybe I like the way his thumbs hold up the wool. Walter: Anytime his thumbs get tired. Only with me around, you wouldn't have to knit. Phyllis: Wouldn't I? Walter: You bet your life you wouldn't.