The Importance of Smiling at McDonald's

"It seems to be hell working in a Dunkin' Why?" "Imagine doing the same volume as a Starbucks but also making omelets." McDonald's has an original formula that is just solely made for McDonald's, he says. He believes Diet Coke syrup that they use was never updated. And why is there Sprite so spicy? I think it's carbonation levels in the machines, right?