The world is a STRANGE place, you know. I have a grand-niece who has a genuine genetic problem so she is compulsively happy. Give her a gift of any kind and it is the best thing anyone has given her ever, for example. Amongst other things, it means she has no sense of risk and will approach and chat to anyone in a completely trusting way. As a child this is just about tolerable but her parents are seriously worried about how she will cope when she is older.