A biologist, a physicist, and a mathematician are all eating on the patio of a restaurant. Across the street, they see two people walk into a building, and a few moments later three people walk out.
The biologist says, "Oh, they must have reproduced."
The physicist remarks, "There must have been some type of statistical error."
All are quiet for a long while before the mathematician says, "You know, if one more person walks into that building it will be empty."
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