A logician's wife is having a baby. The doctor immediately hands the newborn to the dad. His wife asks impatiently: "So, is it a boy or a girl" ? The logician replies: "yes".

Teacher: "Little Johnny, give me a sentence using the word, 'geometry.'" Little Johnny: "A little acorn grew and grew until it finally awoke one day and said, 'Gee, I'm a tree.'"

Three men, a philosopher, a mathematician and an idiot, were out riding in the car when it crashed into a tree. Before anyone knows it, the three men found themselves standing before the pearly gates of Heaven, where St. Peter and the Devil were standing nearby. "Gentlemen," the Devil started, "Due to the fact that Heaven is now overcrowded, St. Peter has agreed to limit the number of people entering Heaven. If anyone of you can ask me a question which I don't know or cannot answer, then you're worthy enough to go to Heaven; if not, then you'll come with me to Hell." The philosopher th ... read more

So Descartes goes into a bar late one night for a beer. At closing time, the bartender makes Last Call and asks him, "Get you another?" Descartes replies, "I think not." And disappears.

Old mathematicians never die - they just lose some of their functions.