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Ein lustiges Handbuch vom Meister aller Klassen Douglas Adams:

A man was giving a lecture on sexual techniques. There were, he
said, eleven basic positions for sexual intercourse. "Two hundred
and ninety seven!" interrupted a voice from the back. "The first
of these eleven basic positions -," continued the speaker. "Two
hundred and ninety seven," shouted the heckler again. "- is the
one in which the man lies on top of the woman."
"Oh," said the heckler, momentarily flummoxed, "two hundred and
ninety eight!"

http://www.heise.de/newsticker/meldung/72970
http://de.wikipedia.org/wiki/Towel_Day