Which phenomenon is illustrated in each of the following situations?

1. The president's closest advisers are afraid to disagree with his views on energy policy.
2. You are at a costume party wearing a silly gorilla suit. When you see a chance to play a practical joke on the host, you do it.
3. Walking down a busy street, you see that fire has broken out in a store window. "Someone must already have called the fire department," you say.

1. groupthink
2. deindividuation 
3. bystander apathy brought on by diffusion of responsibility