All members of Mensa have I.Q.s of at least 140.
At one Mensa convention, several members at a local cafe noticed the shaker with an S on top, for salt, contained pepper and their pepper shaker, with a P on top, was full of salt. How could they swap the contents of the bottles without spilling anything and using only the implements at hand?
Clearly, here was a marvellous Mensa mystery! They presented ideas, debated them, and finally came up with what they felt was a brilliant solution involving a napkin, a straw, and an empty saucer.
They called the blond waitress over to dazzle her with their solution.
"Ma'am," they said, "we couldn't help but notice that the pepper shaker contains salt and the salt shaker contains..."
"Oh, sorry!" interrupted the blond waitress... and she unscrewed the caps of both bottles and switched them.
Some people are smart and some people are simply educated beyond their intelligence.
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