When my children were younger, I devoted my ife to embarassing them at every possible opportunity. I think I did a good job.
My favorite thing to do, and one I've not given up, was shopping around the holidays with a pocketful of wrapped candies. When there were surly, snarly people in the endless lines, I'd offer them a piece of candy. "Here, it looks like you could use this."
The kids, of course, wanted to MELT.
You might be able to come up with an alternative use for this technique. Blowing bubbles as you come down the hall comes immediately to mind.
Pamda, whose engineering credentials extend only to understanding the AMTRAK schedule.