1. Logout of your computer. It's not hard to remember, and you really, really want to, lest someone besides your friendly neighborhood TA notices that you're still logged in.
2. Why do so many of you have your keys and your IDs on the same ring? Besides the fact that it makes it a bitch to scan your ID in the cardreader, if you lose the keychain, then someone can pick it up, look you up in the student directory, and have keys to your house. (Note to all potential stalkers: don't bother, I have a directory block.) This is not wise.