Wise Man Or Wise Guy?

Another one from Irene.

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Smart Man
A small boy accompanied his parents to a nudist colony. They all stripped off and went out into the garden. The boy looked round with interest and then asked his father why some men had big ones and some men had small ones.
Dad couldn't be bothered with long explanations so he just said, "Those with big ones are smart and those with small ones are stupid"
The boy wandered off on his own for a while and then met his father again.
"Have you seen mother?" asked his Dad.
"She's behind that bush over there," said the boy,"talking to a stupid man who's getting smarter by the minute!"