Interesting that you have this experience. I don't use a cane for my vision issues, but I do use tall hiking poles because of my physical disability. The last ones I had were mainly red, and the last time I used them a lady who came up behind me shook her keys so they were jingling and she said it was because she didn't want to startle me. Apparently she'd been doing it a while but I didn't hear it until she was practically next to me since I don't hear well either.

If I heard a random person, "Do-do-do-do"-ing some Tom's Diner in public it would make my day!