Nearly a third of people have forgotten to turn off electronic devices when on an aircraft

"In a study released on Thursday by two industry groups, the Airline Passenger Experience Association and the Consumer Electronics Association, as many as 30 percent of all passengers said they had accidentally left a device on during takeoff or landing. About 67 percent said they had never done this, always ensuring that their electronics were turned off. Four percent were unsure."

Source:  Daily Telegraph, 9th May 2013