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Socrates called it a sensation of both pleasure and pain. But the tickle is the one legal move that the UFC won't talk about — especially after the tickle went viral. Correspondent David Fleming giggles his way from a rat-titilating neuroscientist in Germany to a cage-side gaggle at a wedding ballroom in Rochester, exploring the science of laughter, the art of war and a truly genius alternative to the purple nurple.

• Pre-order David Fleming's book, "A Big Mess in Texas: The Miraculous, Disastrous 1952 Dallas Texans and the Craziest Untold Story in NFL History"

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