Early in IBM's internal rollout, I worked for IBM - I demoed to one of IBM's security guys how to embed a button in an email to all users within IBM that would

Early in IBM's internal rollout, I worked for IBM - I demoed to one of IBM's security guys how to embed a button in an email to all users within IBM that would delete their own mailbox when clicked. (Did not actually send it, of course) His reaction was, "Oh, shit." I don't know who he talked to, or if it was just a coincidence, but Execution Control Lists came out really quick on the next version.