Deindividuated participants in lab studies often behaved badly, such as stealing, aggressing, or doing other antisocial things.

Deindividuation theory suggests that in situations where individuals are not seen as personally identifiable, they are more likely to engage in atypical, often antisocial behavior due to a reduction in the fear of negative evaluation or consequences. Lab studies have shown that deindividuated participants can exhibit behaviors such as stealing or aggression, supporting this theory.