If you open it, close it.

If you turn it on, turn it off.

If you unlock it, lock it.

If you break it, repair it.

If you can't fix it, call someone who can.

If you borrow it, return it.

If you use it, take care of it.

If you make a mess, clean it up.

If you move it, put it back.

If you don't know how to operate it, leave it alone.

If it belongs to someone else and you want to use it, get permission.

If it doesn't concern you, mind your own business.