Trying to convince someone who just isn't going to be convinced can be tiring at the very least. Why do we persist and is there another way? Don't forget, if you or your friends would like to view past tips, you can do so by clicking here. And if you'd like to forward these tips to a colleague or friend just click below.I remember the first time I saw Tim Henman's father in the audience at Wimbledon. My God, I thought, he looks hard to please. And I wondered if that was at