A man and a woman who have never met before find themselves in the same sleeping carriage of a train. After the initial embarrassment, they both manage to get to sleep; the man on the top bunk, the woman on the lower. In the middle of the night the man leans over and says, "I’m sorry to bother you, but I’m awfully cold and I was wondering if you could possibly pass me another blanket."
The woman leans out and, with a glint in her eye, says, "I’ve got a better idea… let’s pretend we’re married."
"Why not?" laughs the man.
"Good," she replies. "Get your own damn blanket."