A man and a woman who have never met before find themselves in the same sleeping carriage on a train. After the initial embarrassment they both go to sleep -- the man on the top bunk, and the woman on the lower.

In the middle of the night the man leans over, wakes the woman and says, "I'm sorry to bother you, but I'm awfully cold and I was wondering if you could possibly get me another blanket?"

The woman leans out and, with a glint in her eye, says, "I have a better idea, just for tonight, let's make pretend that we're married."

The man says happily, "OK! Sure!"

The woman says, "GOOD. Get your own damn blanket!"