A guy walks into the bedroom carrying a sheep in his arms and says, "Honey, this is the cow I make love to when you have a headache."

The wife, lying in bed reading a book, looks up and says, "If you weren't such an idiot, you'd know that's a sheep, not a cow."

The guy replies, "If you weren't such a presumptuous bitch, you'd realize I was talking to the sheep."
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Whoever undertakes to set himself up as a judge of
Truth and Knowledge is shipwrecked by the laughter
of the gods.

-- Albert Einstein