I once saw a piece about good and evil which used the sort of scene you might get in a thriller. Two men are fighting on a cliff top, and one falls over the edge, hanging on by his fingertips. How can you tell if it is the hero or the villain who has fallen?I use this with children who seem too ready to accept that the hero of a cartoon is the hero because he/she always wins, and they can usually work out the differences between the characters.
Penny