Oh crumbs, 'singalong' folk in the seat next to you who can't contain their desire to participate in an opera or musical. And Phobile Moan Addicts who bleep and text and light up the cinema with their infernal technology. And bus passengers behind you who relate all the gossip to their neighbour, or a running commentary on what they can see out of the window. In fact, everyone should become a Trappist when they leave the house!