An act of kindness at a McDonald's has customers paying it forward.

FOX's Lilian Woo reports: 

At an Indiana McDonald's, a customer's act of kindness sparking a chain reaction, which lasted 167 drivers Sunday. Starting with a woman who paid for the large order of a man with four kids in a van behind her. The cashier says the lady's message was Happy Father's Day, the recipient then paid for two cars behind him and so on, from 8:30 at night till midnight, closing time.

The restaurant's manager said there was one time when a customer threaten to break the streak, but the staff pooled $27 to keep it going.

Lilian Woo, FOX News.

Follow Lilian Woo on Twitter: @LilianNY