Once, when I was working in a primary school as a teaching assistant, I had the distinct pleasure of seeing human nature at its finest. One little girl who, to protect her 5 year-old dignity, we shall call Cindy, promised another little girl- Daisy- a set of stickers. Daisy was understandably delighted. However, shortly afterwards, regretting her moment of generosity, Cindy then decided that she no longer wanted to share her stickers with Daisy, that her stickers would be bet