Social psychologists have known for decades that, if we reduce our sense of our own identity – a process called deindividuation – we are less likely to stick to social norms. For example, in the 1960s Leon Mann studied a nasty phenomenon called "suicide baiting" – when someone threatening to jump from a high building is encouraged to do so by bystanders. Mann found that people were more likely to do this if they were part of a large crowd, if the jumper was above the 7th floor, and if it was dark. These are all factors that allowed the observers to lose their own individuality.