A doctor, a lawyer, and a physicist were having a drink, and the topic of conversation was: Is it better to have a wife, or a mistress? A wife, says the doctor: there are various diseases you are somewhat more likely to get from a mistress. A mistress, says the lawyer: then, if it doesn't work out, you don't have the agony of a divorce. A wife *and* a mistress, says the physicist, because then, when your wife thinks you're with your mistress, and your mistress thinks you're with your wife, you can do *physics*.
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