I really have met some of the nicest people on bikes - cue the aged Honda ad!
I have paid it back as best I could - I remember one day on the 403 offramp at Dundas in Oakville, seeing a guy trying to bump start his 1200 Suzuki Bandit. I pulled my car over, and ran back to help - he was amazed, even when I told him that I rode an 1100 Suzuki, that someone in a car would actually help him!
Not sure what Harley guys love, but I can only imagine that summer gloves, or a piece of chrome would be a nice gesture.