Adding to the ancient and honorable category of "all odd numbers are prime" jokes, David Mortensen posts a link to a version featuring subtypes of linguists. Those not familiar with the field may need to take a linguist to lunch in order to get an explanation...
Update: Dave Long emailed to point out that according to Google, some odd numbers are more (widely regarded as) prime than others:
proposition (ghits) ----------- ------- 3 is prime (937) 5 is prime (740) 7 is prime (709) 9 is prime (443) 11 is prime (663)
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Posted by Mark Liberman at August 11, 2004 10:43 AM