A man walks into his bedroom with a sheep under his arm. His wife is busy reading when he walks in, and she sets her book down into her lap when she hears him say "Honey, this is the pig I fuck when you have a headache."

She looks at him puzzled, and says "Dear, if you look closely, you’ll see that’s a sheep, not a pig".

He looks at her... and says "If you look even closer, you’ll see that I’m not talking to you."