Human beings are selfish things. You only need to glance through a squinted eye visually impaired by a bout of glaucoma at Simon Cowell to see this. We are selfish because we are stressed a LOT of the time. Whether you're teenagers, adults or grandparents, there's always something to trigger a wave of impatience or sudden, snappy reactions which you might not have done otherwise, whether it be romances, politics, bad table manners etc, et...