"yeah, yeah" again (another versions)

[Dan Nussbaum]

I always told it as a joke without attributions. It worked very well as
a test of the listener's intelligence. When I told it in my office, the
more educated listeners laughed their heads off, the others stared at
them in wonder.

Dan Nussbaum

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The American Dialect Society - http://www.americandialect.org