Flunitrazepam.
Wallet (have to carry it. Yay license), phone, zune, and Brisingr.
I keep Chloroform, it's easier to get hold of.
Wtf
House keys, and that's about it. If I'm at school, usually a pen and pencil too. I don't own a cellphone and I rarely need money for most situations.
Anti noob repelant. (works every time).