We used to have a post up about Milgram’s famous obedience study, in which he led people to think they were giving other participants electric shocks, including some that were supposedly at a fatal level. It’s often used as an example of unethical research, since some participants suffered mental distress because they thought they had seriously hurt or even killed someone. We took the original post down when the videos we linked to disappeared, but I just found another video of some footage. For some reason it won’t embed, but here’s a link.
UPDATE: The original footage has been taken down, but the BBC did a replication: