People frequently lose things on buses. Sometimes they end up in the company's lost and found, and sometimes they're just never seen again. One Rome bus driver really went the extra mile to return a lost wallet to a Rome teenager.
You've probably been involved at a CNY pay-it-forward chain. Maybe it happened for a few cars at Dunkin' Donuts, or McDonald's. However many cars paid-it-forward, you probably didn't beat the streak that happened at a McDonald's.