This one was a squeaker cuz of time pressures. It came together when I looked at a group of photos I had taken of signs over the past few weeks.
I walked around at lunch time and saw that people tossed trash where they thought no one would look. I imposed upon a person who demands to remain un-credited with rifling in his back seat for a few moments for his or her involuntary collection of newspapers.
Once I recorded that the piece came together in my head.
Some days you just gotta go with the inspiration as it is delivered to you.