On a recent flight with an European airline, an US passenger at a window seat was not happy about open shades requirement during takeoff and landing, mind you she already had eye and face masks covering her entire face. She went on an expletives filled rant about how she needed to sleep after a redeye. She got into it with her seatmates and one of the flight attendants, but quickly retreated after FA and fellow pax educated her. Love the no nonsense from our European friends.