Slice reader Jim Malm shared an observation from the weekend.

"I was driving behind a young woman in a small station wagon with a dog in the back who was apparently returning from a dog walking excursion," he wrote. "She had conscientiously picked up after her dog but apparently didn't want the offending material in the car with her, because a lumpy green pastic bag was tied to the rear windshield-wiper motor post.

"It took awhile for me to realize what the situation was, but then thoughts of interesting unintended consequences immediately came to mind, particularly if the baggy had been attached to the wiper blade."

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