But the stupidest thing I have ever seen on airplane was yesterday: two guys sitting behind me, returning from a hedonistic destination in Mexico, who started playing Yahtzee before the plane took off. With the cup and the dice and throwing it on a deployed tray table. Seriously.
I was trading emails with a guy at his work email address and he responded after hours one time with the signature "Sent from my iPad" and I suddenly had a much lower opinion of him. I can't stop picturing him dragging his fingers across the screen and interrupting videos to craft emails.