A herd of zebras
A biologist, a statistician, a mathematician and a computer scientist are on a photo-safari in africa. They drive out on the savannah in their jeep, stop and scout the horizon with their binoculars.
The biologist: 'Look! There's a herd of zebras! And there, in the middle : A white zebra! It's fantastic! There are white zebra's! We'll be famous!'
The statistician: 'It's not significant. We only know there's one white zebra.'
The mathematician: 'Actually, we only know there exists a zebra, which is white on one side.'
The computer scientist: 'Oh, no! A special case!'
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