A certain private school was faced with a unique problem, where a number of 12-year-old girls were beginning to use lipstick.
They would apply it in the bathroom, which was fine. But after that they would press their lips on the mirror leaving dozens of little lip prints.
Every night the maintenance janitor would remove them, and the next day the girls would put them back.
Finally the principal decided that something had to be done.
She called all girls to the bathroom and met them there with the maintenance janitor. She explained that all these lip prints were causing a major problem for the custodian who had to clean the mirrors every night (you can just imagine all the yawns from the little princesses).
To demonstrate how difficult it had been to clean the mirrors, she asked the maintenance janitor to show the girls how much effort was required.
He took out a long-handled mop, dipped it in the toilet, and cleaned the mirror with it.
Since then, there have been no lip prints on the mirror.