I pretty much ignore every weirdo that I encounter. Give a homeless person money, they will continue to pester you from then on. Talk to a random stranger and they will consider you their friend and will continue to pester you. IGNORE EVERYONE.

There was one tramp who I regularly talked to though while I was going to secondary school called Pierre who, according to him was once a french millionaire who got conned out of his money from his wife. He was the man. He smoked on the train and didn't give a smurf about what anybody thought. Plus we wrote him a sign saying "Why lie. I need a beer" and he used it from then on. I must have given that man about £50 over the time I knew him. He was a great man.