I dislike this 'demand or menace' activity intensely. I can't think what the parents are trying to teach their kids. Surely the kids would be less keen if a bigger kid in the playground did much the same to them for their dinner money ? Why can't the parents buy their own kids sweets ? Hold a Halloween party for them and their little friends somewhere where they can dress up, play games, win prizes, rather than be antisocial to their neighbours in this way. Yet another awful US culture thing being taken up to the loss of our own traditions. :-(