The following comes from Elliott Sober (Dept. of Philosophy,
University of Wisconsin-Madison, ESober@macc.wisc.edu), who considers
it his favorite joke about philosophy:
A boy is about to go on his first date, and is nervous about what
to talk about. He asks his father for advice. The father replies:
"My son, there are three subjects that always work. These are
food, family, and philosophy."
The boy picks up his date and they go to a soda fountain. Ice
cream sodas in front of them, they stare at each other for a long
time, as the boy's nervousness builds. He remembers his father's
advice, and chooses the first topic. He asks the girl: "Do you like
potato pancakes?" She says "No," and the silence returns.
After a few more uncomfortable minutes, the boy thinks of his
father's suggestion and turns to the second item on the list. He
asks, "Do you have a brother?" Again, the girl says "No" and
there is silence once again.
The boy then plays his last card. He thinks of his father's advice
and asks the girl the following question: "If you had a brother,
would he like potato pancakes?"
(From the "Rest" of RHF)