In the middle of the night the woman 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 man leans out and with a glint in his eye said "I've got a better idea ... let's pretend we're married."
"Why not," giggles the woman.
"Good," he replies. "Get your own blanket!."