Summarize the conversation between Yossarian and Lt. Scheissfopf's wife on Thanksgiving day.

At the hospital, Yossarian has the most rational, pleasant Thanksgiving dinner he has ever had. (Later, Yossarian remembers this Thanksgiving, when the following year he spends it with the eccentric Lieutenant Scheisskopf's wife. They bicker about the pain in life and about why God created pain. Yossarian becomes short-tempered and begins to blaspheme against God, and the wife beats him in anger.)