How can cooperation be made into the most appealing option? Game theory could hold the answers. The man who won an IgNobel Prize at Harvard for using quantum physics to calculate the best way of dunking a biscuit provides new tactics for solving real problems, from dealing with drunks, navigating one's way through queues and defusing conflict, to helping prevent global warming. Games like the 'Prisoner's Dilemma' (where you can avoid going to jail if you shop your mate - and vice versa), 'Rock, Paper, Scissors' and others turn out to be very powerful models with real application to ordinary life that can help us understand both big and small problems. This is the application of high level mathematics and profound psychology at its most practical, appealing and - happily - easily understandable.