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 trans-continental 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 fucking blanket.'
After a moment of silence, he farted.