Did you hear about the typographer who didn't believe in angels?
All his typefaces were sans seraph.
*rimshot* *cue groans*
A couple of previous ones:
http://typophile.com/node/9675
http://typophile.com/node/58525
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I don't know if the fact that I can't laugh at most of these typographic jokes means I don't have humor or you don't. Either way it makes me realize typographers are odd people.