Five Apes in a cage.

Start with a cage containing five apes. In the cage, hang a banana on a string and put stairs under it. Before long, an ape will go to the stairs and start to climb towards the banana.

As soon as he touches the stairs, spray all of the apes with cold water. After a while, another ape makes an attempt with the same result -- all the apes are sprayed with cold water.

Turn off the cold water. If, later, another ape tries to climb the stairs, the other apes will try to prevent it even though no water sprays them.

Read more: Five Apes in a cage.

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