The Iron Giant is now my psychopath test. If you haven't read the book the Psychopath Test you should do so. It gives a long drawn out series of test that you can use to see if someone is a psychopath or not. This is encompassed in the narrative of a person committed for life with no proof and a mysterious text. It is very entertaining. Based on the actual psychopath test, I have created my own expediated test. Have someone watch Iron Giant with you. Watch them during the Be who you want to be scene. Look for emotional reaction. If there isn't any or you see confusion, the given person is a psychopath. Works really well on kids, so invite your children's friends over and see which one of the little buggers is missing a soul. Statistacally 4% of the total population lack that inner voice that helps them establish right from wrong so chances are you and your family know a few. Warning: if watching in a group, the psychopath will mimmick the reactions of those around him/her, so be careful. This test is not actually scientific, so take results with a grain of salt. But come on, they should be in tears, or something is wrong with them.