A man comes home late one night roaring drunk, carrying a duck under his arm.
He crashes through the front door, hammers up the stairs, taking care not to hurt the duck.
He kicks open the bedroom door and switches on the light. His wife is sitting up in bed, open mouthed, glaring at him.
"Well?" hollers the man, "what do you think of my pig?"
"You drunken fool," she shouts back, "that's not a pig, that's a duck!"
To which the man turns to his wife and yells: "I wasn't talking to you!"