It was an etiquette guide telling people to remember to wash, open car doors and that sort of thing.

Now a group of users say that the controversial devices need something more important: an etiquette guide.

They may not in fact be the best etiquette guide for the modern theatregoer.

Dinner jackets were considered from the first less formal than full dress (cutaway) and etiquette guides declared it inappropriate for wear in mixed company.