A few years ago, there was a Mensa convention in San Francisco, and several
members lunched at a local cafe. While dining, they discovered that their
saltshaker contained pepper and their pepper shaker was full of salt. How
could they swap the contents of the bottles without spilling, and using only
the implements at hand?
Clearly this was a job for Mensa! The group debated and presented ideas, and
finally came up with a brilliant solution involving a napkin, a straw, and
an empty saucer. They called the 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..."
"Oh," the waitress interrupted. "Sorry about that." She unscrewed the caps
of both bottles and switched them.
