Only In Naperville - Again!

Just back from a trip to Jewel where I bought a few things for next week's barbecue - yes it's nearly that time of year again. As the girl in front of me was paying, she held up a bottle of chocolate sauce.
"This isn't mine," she said.
The cashier apologized, and I realized it had crossed over the little barrier from my line of groceries.
But as the cashier went to remove it from her bill, the girl said to leave it.
"It's ok, I'll just give you the cash," I said, reaching for my purse.
"No, that's fine. Have it on me," she said.