Voted best joke in Australia:
Stan walks into his bedroom with a sheep under his arm and says:
"Darling, this is the pig I have sex with when you have a headache."
His girlfriend is lying in bed and replies: "I think you'll find that's a sheep, you idiot."
The man says: "I think you'll find that I wasn't talking to you."
Hey, I didn't write it or vote for it.
