You and your friends have arranged to see a late-night movie at the cinema. With a Coke and a bag of popcorn, you sit down in your seat, looking forward to the film.

The cinema is busy, almost overcrowded, when a guy sits down next to you. Suddenly you feel a slight pressure on your elbow. The guy secretly tries to push your arm off the backrest.

You try not to show it, but your look speaks volumes. You've prepared yourself for the battle for the armrest... You slowly return the pressure with your elbow against his arm. You move your arms back and forth without comment until suddenly your arm slips away and your popcorn flies away.