I have just seen a thread on another forum which ran along the lines of "Why do I always attract the loonies?" and other people piling in and sympathising 
Basically this person on holiday, met someone who was obviously not mentally well, clearly delusional and behaving innappropriately. As they were on a campsite their reaction was to up sticks and camp elsewhere. They then went on to note that other people also moved away from this person and that they were all relieved when the person left.
I just though it was so sad and that it was upsetting that people thought it was OK to laugh at this man. But then, I wondered, what would I have done? I obviously wouldn't have laughed. He didn't seem dangerous from the OP but just in another world. Is there someone who should have been called to help this man? An emergency psych team? Would anyone actually come to help?