Even pretending isn't much fun

 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, asking,
   "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.