Trains:
It's impolite to use your phone on the train and most people reading on the train have their books covered in an anonymous brown cover so that you don't know what they're reading. On the other hand I've now seen people clipping their finger nails and their eyelsahes on the train. Go figure.

Also, I've been going to my Saturday job on the "Romance Car" which is a train designed for romance presumably. The most romantic thing is that you can swivel the seats round to face each other. They have a sign saying "Please leave your phones in the gap between the carriages".