- A Mathematician, a Biologist and a Physicist are sitting in a street cafe watching people going in and coming out of the house on the other side of the street. First they see two people going into the house. Time passes. After a while they notice three persons coming out of the house. The Physicist: "The measurement wasn't accurate.". The Biologist: "They have reproduced". The Mathematician: "If now exactly one person enters the house then it will be empty again."
- A doctor, a lawyer, and a mathematician were having a conversation about the relative benefits of wives and mistresses.
The doctor insisted that, from a health perspective, it was far better to have a wife. He talked about stress, relaxation, routine, and other factors.
The lawyer contended that it was better to have a mistress, because that way you retain more of your legal rights, she doesn't own half your property, and so forth.
The mathematician said that he could see both sides of that argument, but really he thought it was best to have both.
"Both?", the doctor and the lawyer exclaimed. "Why?"
"Sure, both. That way, when the wife thinks you're with the mistress, and the mistress thinks you're with the wife, you can sneak off by yourself and do mathematics."
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