Let's pretend that we're married
A man and a woman, who have never met before, but are both married to
other people, found them selves 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, "Excuse me miss, 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 blanket!"
After a moment of silence, he farted.