A can opener....I totally forgot it, and I remember staying my first night in my studio near campus and was gonna have some canned chili for dinner...and realized I had no way of opening it. Luckily, my boyfriend at the time had a utility knife on him and opened it that way. LOL. Not all cans come with the tab to self open, beware!
Additionally, I also needed a broom! (which I guess only applies to those living in non-carpeted quarters).