On an easyJet flight into Luton (don't ask!) I was in the window seat and there was a random between me and the rather important fat Indian business man on the aisle. You know the type, likes to be seen, make a point of asking the crew slightly annoying questions. "Why do I have to put my tray table up?"
Phone comes out on finals, I, thumping headache after a bad day at the office asked him politely to put it off. He immediately launched into why he thought it was perfectly safe but I pointed out I would simply take it off him, switch it off and hold onto it until the Police were summoned at the gate. I was in no hurry by this point... That seemed to work. I apologised later to the poor chap between us who looked benignly ahead the whole time.
Just turn it off for five minutes for the love of God.....