It makes for a much better joke if you start at one ;-) It is actually a pretty old joke, there are a few variations on it (one for Computer Scientists, one fo

It makes for a much better joke if you start at one ;-) It is actually a pretty old joke, there are a few variations on it (one for Computer Scientists, one for Mathematicians, etc...): http://www.phy.ilstu.edu/~rfm/107F07/EPMjokes.html http://www.phy.ilstu.edu/~rfm/107F07/EPMjokes.html