I rang my bell at a couple of pedestrians this morning and the woman jumped about two feet in the air, scurried to the guard rail on the right side of the path (it's by the river there), and *flattened* herself against the railing, literally clinging to it with her hands as though she expected to have to vault over it to escape the scary cyclist. The path is ten feet wide at that point, I had rung the bell a full twenty feet before I passed, and I was coasting on my old Raleigh so the "tickety" noise of the freewheel was pretty loud. And I was going about 10 kph. I really don't know what else I could have done... I hope that woman never goes on the other pathways that are narrower and have more traffic; she'll die of fright.

I ring my bell for pedestrians and slower cyclists, just in case, but yeah, about 25% of the time they react by jumping or swerving.