Today, I saw a very odd reputation message on my account:
-1 3 hours ago removed User was removed
Obviously, I lose reputation points if I'm upvoted by someone who is later removed, or gain reputation points if I'm downvoted by someone who is eventually removed. So far, so good.
Since I'm not sure under what circumstances a user can net me a single reputation point in the first place, how can I lose exactly one reputation point from the removal of that user?