Take the controller to the hardware store and show it to an employee there. They can show you which screwdriver you need to buy. Your only other option is to try to borrow the correct screwdriver from a friend.
If you don't want to tell the truth, at least tell the same lie to everyone. Keep your lies non-specific. Say "I went out", rather than "I went to watch...
Making your Xbox a "home Xbox" allows you to share games, downloadable content, and even your Xbox Live Gold subscription with anyone else who signs in on your console.
