'Talk to the Hand' explores the boorishness of the modern world, and the sense of outrage that infects us when we discover that other people are - generally speaking - crass, selfish and inconsiderate That man just dropped a cigarette packet on the floor Should you do anything? You say to the shop assistant,'Can you tell me the price of this? There doesn't appear to be a label' and she says, 'What do you think I am, psychic?' In her follow-up to 'Eats, Shoots & Leaves', Lynne Truss asks why rudeness is a universal flashpoint and examines specific sources of affront