The Idol and the Ass.

An ass felt it his duty to destroy superstition, so he went up to the brass idol in the market-place and gave it a vigorous kick.

A dog came to him as he lay groaning on the ground, nursing his broken leg, and said, "Well, did you prove anything?"

"Nothing," said the other. "Except that I am an ass."

Deductions to be drawn: Any old thing.