A certain private school was faced with a unique problem: A number of junior high girls were beginning to use lipstick and would put it on in the bathroom. That was fine but after they put on their lipstick they would press their lips to the mirror leaving dozens of little lip prints.
Every night the 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 the girls to the bathroom and met them there with the janitor. She explained that all these lip prints were causing a major problem for the janitor who had to clean the mirrors every night.
To demonstrate how difficult it was to clean the mirrors, the principal asked the janitor to show the girls how much effort was required. He took out a long-handled squeegee, dipped it in the toilet water, and cleaned the mirror with it.
Since then there have been no lip prints on the mirrors.
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:-) 
