Not Mackey D’s, but I placed an order for $100 of taco bell recently. They were still making it when I got there. It was the manager and 2 employees busting their asses to crank out the order as fast as they could while a line was forming at the counter and drive through.
The manager brought me the food and apologized for the wait. I handed him 3 x $5 bills as thanks. I genuinely appreciated the service and wanted to say thanks.