Man's Project: Stealing His Own Bike - Video

The Bystander Effect:

The term bystander effect refers to the phenomenon in which the greater the number of people present, the less likely people are to help a person in distress. When an emergency situation occurs, observers are more likely to take action if there are few or no other witnesses.

[link to psychology.about.com]

Just for comparison purposes, another bike stealing experiment first with a young white man, then a young black man. Watch the difference in reaction.