Joke: How to start a fight with your wife

My wife and I are watching Who Wants To Be A Millionaire while we were in bed. I turned to her and said, "Do you want to have sex?"

"No," she answered.

I then said, "Is that your final answer?"

She didn't even look at me this time, simply saying "Yes."

So I said, "Then I'd like to phone a friend."

And that's when the fight started....