(This is from a little book called Buurmans hemd nader bekeken, by
Harry de Jong (in Dutch). I thought it deserved a bigger audience.
Hans)

How often a week do you sleep with your wife?
asked the inquirer.

Three times, I said without hesitation.

That is once more often than your neighbour,
the inquirer said, writing.

That makes sense, I said, after all, shes my wife.

Hans Buurman, Pattern Recognition Group
Faculty of Applied Physics, Delft University of Technology