A large spider in an old house built a beautiful web in which to catch flies.
Every time a fly landed on the web and was entangled in it the spider devoured
him, so that when another fly came along he would think the web was a safe and
quiet place in which to rest. One day a fairly intelligent fly buzzed around
above the web so long without lighting that the spider appeared and said,
"Come on down." But the fly was too clever for him and said, "I never light
where I don't see other flies and I don't see any other flies in your house."
So he flew away until he came to a place where there were a great many other
flies. He was about to settle down among them when a bee buzzed up and said,
"Hold it, stupid, that's flypaper. All those flies are trapped." "Don't be
silly," said the fly, "they're dancing." So he settled down and became stuck
to the flypaper with all the other flies.
Moral: There is no safety in numbers, or in anything else.
- -- James Thurber, "The Fairly Intelligent Fly"