If you borrow something, return it, and make sure it's clean.
If someone leaves their trash behind, throw it away with your trash.
If you can help someone have a little brighter day, smile and show kindness.
If we all help out a little, then the burden is not on one person, and makes the world better.
Ralph Waldo Emerson: “To leave the world a bit better, whether by a healthy child, a garden patch, or a redeemed social condition; to know that even one life has breathed easier because you have lived — that is to have succeeded.”