Smile

Someone gave me a smile today,
I tried my best to give it away
To everyone I chanced to meet
As I walked down the street.
But everyone that I could see
Gave my smile right back to me;
When I got home, besides my smile,
I had enough to reach a mile!

Submitter comment:

Informant says she has known it for a long time but has no record of source.

Where learned: Washington, DC