Brighten someones day by buying them coffee. It can be whoever you want. The next person in line, a stranger walking by, or even buy a gift card to post on social media.
A correct submission will:
On a rainy Friday at Canteen in Brooklyn, I offered to buy the woman in line behind me a coffee. My good deed was met with suspicion, followed by awkward stares. I quickly explained that a customer the previous day had paid for my coffee, so I wanted to do the same for someone else. The suspicion lingered, so I paid and left. Good deeds can throw people off in Brooklyn, Ed specially on rainy days. Also the cafe uses the Square app, so I got an electronic receipt.