This morning I was in the queue to buy a parking ticket from a vending machine. An older man was ahead of me; he inserted $ 2 in coins and was waiting for the ticket to print. I patiently waited while he struggled to get the ticket. I realized that the machine was not accepting the coins. I told him not to worry that he could use my credit card and helped him to buy the ticket. He thanked me profusely.
I was about to swipe my card again, this time for myself, when a lady approached me from nowhere. She offered me a parking ticket that she purchased by mistake, and would not require any more. She handed over the ticket to me and walked away. I accepted it, thanked her, and noticed that the ticket was valid for another 1.5 hours.
I finished my work in just 15 minutes. This parking ticket was still valid for a little more than an hour. I thought I should also give this to someone before I leave the building. So I went to the vending machine and offered it to an unknown person.
He also thanked me, and I left the building.
Kindness is contagious and the rewards are other acts of kindness.