I've never heard of it, but a sweet reader who is also a girl describes it to me this way this morning:
The person in front of you buys your coffee. What do you do? Well I feel guilty and I buy the person's order behind me. It then turns into a chain. The longest chain has been33 cars (last time I asked). I stopped buying for the car behind me for a little bit, but I felt too guilty. I feel really bad for the person in front of me because most of the time I have 3 drinks. The person behind me was only $4 so I saved $5 this morning . . . .
When did this start?