I've heard the fly idea was developed by a german worker who cleaned the restrooms in a Berlin train station, early 1900's. Painted a bug in the urinal and suddenly the floors were less of a mess to clean.
Speaking of cleaning restrooms -
According to a news report, a small private school in Washington was having a problem. It seemed that a group of twelve year old girls were bringing lipstick to school and putting it on in the restroom. That was fine. But the problem was that after they put it on, they would all kiss the mirror, leaving dozens of lip prints for the janitor to clean off. Every night they were cleaned off. The next day, more lip prints on the mirror.
Finally, the principal decided that something had to be done. She called all the girls to the restroom where she waited with the janitor. She explained that the lip prints were causing extra work for him because he had to clean them off every night. The girls rolled their eyes, stared at the ceiling and did their best to look bored.
To show the girls how hard it was to clean the mirror, she asked the janitor to show them how much effort was required. He took a long-handled squeegee, dipped it in a toilet, then cleaned the mirror with it. After that, there were no more lip prints on the mirror.
