Yesterday we were sitting in someones room. She has a macbook with OS X 10.6. I don't know much about OS X but here's something weird. After like 10 minutes it automatically locks so it asks for a password. The rest of the screen wasn't black but just made a bit darker. It can be compared to a windows UAC prompt, there the screen also get's darker but everything is visible. For fun someone tried to enter a password, and it was wrong. Then he tried again with the password "TIETEN" (yes ), and he says he accidentally hit 2 other keys. And guess what? IT UNLOCKED?!! Now how on earth is that possible? She says that when it automatically locks sometimes the screen just gets darker like now and sometimes it goes completely black (except for the prompt of course). So is there a bug in the OS X login prompt? Or (very unlikely) if the login works with PW hashes, is there a hash collision between her real PW and TIETEN + some key? And no, TIETEN isn't her real password Or could she have set something unsafe in the security settings?