When I worked in Wilmington we had competitions to see who could spot the strangest stuff on the streets, sidewalks and lawns. There were the usual constant food wrappers, empty bottles of cheap booze, used prophylactics, discarded chicken bones and shoes...why is there always just one shoe?
Being as I live and work in the city (and get around in the city in my work car all day long) I also see tons of stuff. Random pieces of someone's weave in the middle of the street. And there was actually 3 shoes in the direct vicinity of where I parked...always an odd number.