From a letter to Ann Landers

  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 break it, repair it.
  5. If you can’t fix it, call in someone who can.
  6. If you borrow it, return it.
  7. If you use it, take care of it.
  8. If you make a mess, clean it up.
  9. If you move it, put it back.
  10. If it belongs to someone else and you want to use it, get permission.
  11. If you don’t know how to operate it, leave it alone.
  12. If it doesn’t concern you, don’t mess with it.

–Author Unknown

http://articles.chicagotribune.com/1999-08-28/news/9908280092_1_dear-ann-landers-golden-rules-team 

Good advice in any relationship.