Voted best joke of the year in Australia:

[JJCJR]

A man 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 wife is lying in bed and replies, "I think you'll find that is a
sheep, you idiot".

The man says, "I think you'll find I wasn't talking to you".