The woman, who ordered an iced coffee at a Starbucks in St. Petersburg, also offered to pay for a caramel macchiato for the person in the car behind her. When the person found out his coffee bill had been taken care of, he paid for the person in the car behind him.
This set off a chain of people paying it forward, with a whopping 378 people paying for the person's order behind them until about 6 p.m. Employees kept a tally, with one barista explaining to the 379th person that there was a "Pay It Forward" chain that had started earlier in the day, and asked if she would like to participate.
In spite of everyone who had done so before her, the 379th person declined to participate, saying she only wanted to pay for her regular coffee and nothing else, according to the Associated Press.
Talk about a party pooper.