Late Thursday morning, I found myself fighting both cabin fever and a caffeine craving, so I decided to take a walk down the block to Starbucks.

I placed my order and when I went to pay, realized I had no money. My wallet was in a different handbag than the one I was carrying. Yeah, I know, #firstworldproblem: "Oh, no, I have too many bags! I can't get my Starbucks!"

That moment when this book could be your biography.

Sitting at a table, I proceeded to download the app on to my phone, hoping I'd be able to use that to pay, when the barista placed my coffee and oatmeal next to me.

"The lady behind you paid," she informed me, gesturing to a young woman.

When I thanked the kind soul, she just smiled and said, "I know how much it sucks to forget your wallet."

So, thank you, sweet stranger, for turning a sucky moment into a good one. I promise to do the same for someone else.

About the Author: Holly Leber is the editorial director of the Daily Do Good. She doesn't own a coffee maker.