Regarding http://open.salon.com/blog/jane_smithie/2009/09/06/venn_diagram_for_your_tired_out_holiday_sunday ...

... being the mildly obessive Ebnerdork that I am,  I have taken the trouble to prepare a new diagram postulating my theory that if we zoom in close and blur the edges a bit, then those having difficulty categorizing themselves might successfuly find the central region to be the critical area for a more accurate placement.
For example, the red dot is where I'd put myself - A rebellious dork with moderate intelligence but unable to get excited about much :-)