Mathematics and Humor
John Allen Paulos shows in his splendid book "Innumeracy" that humor and mathematics are combinatorial, different sides of the same coin:
"Both mathematics and humor are combinatorial, taking apart and putting together ideas for the fun of it - juxtaposing generalizing, iterating, reversing .... What if I relax this condition and strengthen that one? What does this idea - say, the knotting of braids - have in common with that one in some other seemingly disparate area - say, the symmetries of some geometric figure?"
That's why you will find in this section jokes and anecdotes illuminating the various aspects of mathematics and and highlighting the special character of mathematicians.