The scene: A single-occupancy unisex restroom containing a toilet, a sink and a urinal. There are no partitions and the door is lockable. Sorry, no photograph, but it’s easy to conjure in your mind.

The mystery: On occasion I will enter aforementioned restroom to discover the toilet left in the seat-up position. Now, this room is cleaned early each morning and the seat will be up then, too. But then it’s obvious that it’s been cleaned; the water in the bowl is a lovely antiseptic shade of bluish-green. These other instances, the mystery occurrences, most often occur in the afternoons and the water is its typical achromatic hue.

¿What’s going on here?

nb: The next post in this series will not involve “number two” in the toilet sense.