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, he in the upper bunk and she in the lower. At 1:00 AM, 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 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.