My ex- produced a series of technicolor yawns jusr after take-off on our way back from Charleston. Turned out she'd caught a case of labyrinthitis (an ear ailment), and the change in pressure was all it took. Other than feeling a bit tired the day of the flight, she had no forewarning. Fortunately, an airsick bag was in easy reach.
Ever since, I've checked the seat pocket before take-off.
edited to try a different spelling of labyrinthitis.
[This message has been edited by wideman (edited 03-30-2003).]