Yesterday I traveled by airplane. On one leg of the trip, after we took off, a lady came walking up the aisle to the front of the plane, where the restroom was. The flight attendant, who was still buckled into her seat. told her that the captain had not turned off the seatbelt light, so she needed to return to her seat. A conversation ensued in which the only word audible to me was "diarrhea." It occurred more than once, and then the lady proceeded to the restroom.