1. if you open it - close it.
2. if you turn it on - turn it off.
3. if you unlock it - lock it.
4. if you move it - put it back.
5. if it belongs to someone else and you want it - get permission.
6. if you borrow it - return it.
7. if you don't know how to operate it - leave it alone.
8. if you use it - take care of it.
9. if you break it - repair it.
10. if you can't fix it - call someone who can.
11. if you mess it up - clean it up.
12. if it will brighten someone's day - say it.