I was knitting in the ER in Tralee, Co. Kerry, Ireland, waiting for them to decide whether they were going to admit my partner or not. (They did, eventually.) Lots of people were sort of watching me knit (not much to do in an ER), and eventually a woman who looked at the end of her tether came in with a young boy, sat down, looked over at me, and said, "Now, you had the right idea, so." Then she promptly shut her eyes and appeared to go to sleep.
Another time I was on a bus in London, knitting on a charity hat. I looked up to find three young teenagers and a Indian older woman watching me, the first rather goggle eyed and the latter smiling and nodding. The lady leaned forward, patted my hand, and said, "Is beautiful, beautiful colors!" I said, "thank you, it's for a charity for the homeless." She beamed and nodded again, and then we all went back to doing the standard London "don't talk to strangers on a bus" thing.