This comment [1] suggests that if you type your password HN will remove it automatically. It appears this is correct, because in some places this person's comment is "-- removed --" while in others it contains "(removed automatically)".
How does this work? I'm assuming HN uses a hashed and salted password. Does this mean that HN compares every word you submit in a comment against your password to make sure you haven't typed it in your comment? It seems like that would be enormously computationally intensive.
Or, is this just a silly joke comment?
[1] https://news.ycombinator.com/reply?id=13066958&goto=item%3Fid%3D13065670%2313066958
http://bash.org/?244321
As you can see &u5Tjlo6@K76 passwords are displayed correctly (that password was changed within 1 sec after this comment was posted).