We're all very friendly to each other, and I couldn't imagine any of them stealing from me. Even so, I don't understand why people don't lock their doors when they go out to class. Maybe out floormates would say something to the thief, but the odds are better that either no one will see it or nothing will be said for fear of being rude. Imagine coming back from class to find your whole room was cleaned out. I bet your roommate wouldn't be too happy either.
People just rush in, drop their keys on a table to reserve their seat, and go to get their food.
You need those little notched chucks of metal to open your door, drive your car, and so much more. I'm still waiting for the day when someone just goes around with a bag just taking everyone's keys as a sick joke. Someone could clean out your flex and points before you even get back with your grilled cheese and cereal. It's gone now too, along with your license and any credit cards. Not only is a loss and an annoyance to lose all of your precious plastic rectangles, but now you get the wonderful task of visiting the DMV and canceling all your credit cards.