A man and a woman who had never met before, but who were both married to other people, found themselves assigned to the same sleeping room on a transcontinental train.
Though initially embarrassed and uneasy over sharing a room, they were both very tired and fell asleep quickly, he in the upper berth and she in the lower.
At 1:00 AM, the man leaned down and gently woke the woman saying, "Ma'am, I'm sorry to bother you, but would you be willing to reach into the closet to get me a second blanket? I'm awfully cold."
"I have a better idea," she replied "Just for tonight, let's pretend that we're married."
"Wow, that's a great idea!" he exclaimed.
"Good," she replied "get your own damn blanket."
After a moment of silence, he farted.