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Three Kinds of Men

"There are three kinds of men: The ones that learn by reading. The few who learn by observation. The rest of them have to pee on the electric fence and find out for themselves."
I don't think that Mark Twain was the originator. Most web references cite Will Rogers as having uttered this gem. I haven't found an authoritative source though...
You’re right, Otis. I meant to say Will Rogers, but just had Mark Twain on the brain. I don’t think electric fences even existed in Twain’s days. Another of Rogers’ best was "Never miss a good chance to shut up." And so I will.