A McDonald’s manager in Michigan was rushed to the hospital after a furious customer threw a scalding cup of hot coffee in her face during a meltdown over a delayed order.

Witnesses say the woman was screaming that she’d been waiting “over an hour” for her online order and demanded a refund for two sandwiches — before hurling the coffee at the manager.

“I must have gotten about 100 tips,” said Buena Vista Police. “Within about two minutes, we had her identified.”

The manager suffered minor burns, and charges are now pending against the suspect.

All this… over a sandwich.