From my favorite Jewish humor site...
The Philosopher
A young man was going to evening classes in philosophy to improve his education and when he came home his father always asked him what he'd learned.
"This evening we talked about Einstein and the Theory of Relativity"
"Voos is doos der Theory of Relativity?"
"Well it shows that everything is relative. If you were sitting on a hot stove for five minutes it would seem like an hour, but if you were making love to a beautiful woman for an hour it would seem like five minutes."
The old man thought for a minute. "And from this Einstein makes a living"
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