A man and a woman who had never met before but 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... him in the upper bunk and her in the lower.
At 1:00am, the man leaned over 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 just pretend that we're married."
"Wow! That's a great idea!" he exclaimed.
"Good," she replied, "... get your own damned blanket."
After a stunned moment of silence, he farted.