Do you remember Stanley Milgram's famous authority experiments that found participants were willing to shock the living hell out of people if ordered to do so?
If you’re not familiar with this, just google “Milgram experiment” and get ready for some scary reading. If you ARE familiar with this,
check out this link to a Washington Post article which describes a recent French reality show that found contestants willing to kill for cash. Here is a BBC excerpt on Milgram's work.