Mine, too. And vegetable gardeners.

Once, as I was changing a flat on the side of the road, a car pulled over in front of me and asked if I needed help. I said, no but thanks, and he insisted I take an extra tube from him just in case I had another flat. He told me that he always carries a few tubes in his car just in case he sees a cyclist on the side of the road who might need one. I was so inspired by his generosity that I carry extra tubes in my car now, too.