Presumptions

A man 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 the 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 man replies, "If you weren't such a presumptuous bitch, you'd realize I was talking to the sheep."