Me: Often spotted along 4 Mile Run Trail picking up trailside litter in the evenings.

You: The few bikers (at least 1, sometimes as many as 3 each time I'm out) who slow down to ask if everything is ok or if I need help (not realizing I'm picking up trash vs. say, looking for lost keys or some more serious situation unfolding trailside...)
It is a wonderful, refreshing jolt when strangers take an interest/concern in another stranger's potential troubles like that!