I am always skeptical of the reality of these experiments, but I must say that there seems to be no fiction in this experiment. People forget that these people were selected after a series of eliminations and they are inclined to obey rules. The ending is shocking because it makes you question your own morality. Are you ethical enough under severe conditions? How can we ignore other people's commands and continue in our own path? Now I am a fan of Derren Brown's experiments. Well-done.