“Klein bottle for sale… inquire within.”
(someone just passed this along to me, and once I got the hysterical laughter under control and explained it to my roommate, I figured I oughta share…)
That’s one member of the very, very small set of math humor that I can understand.
And very funny.
I kind of bothered that I’m one of very few people who get that joke. I probably shouldn’t be, though.
Also, thanks for the link Dijon.
‘…and y’know? like I’m starting to feel my work with moebious strips is jsut going in circles…’
Just the kind of thing I like- thanks Erika
That’s a cute joke, Erika!
::goes off to explain the humor to curious son::
Thanks Erika.
I got the joke, does that make me over-educated, or what?
Dijon, that link had me laughing out loud at my desk. Good thing there was nobody else in here but another programmer. 
BTW, want to see a Klein bottle made out of Legos?
http://ftp.surfree.com/werdna/kleinbottle.htm
[whiny British accent] But I want a Lego Klein bottle! [/whiny British accent]