Morale and milkshakes

From a strange article in the NYT about McDonald’s holding an employee-only American Idol-style singing competition (for reasons they don’t exactly make clear)

Employee contests with big prizes are nothing new in corporate America. McDonald’s has pitted stores and regions against one another to determine who makes the best shakes.

But I thought that shakes (sorry, not milkshakes) were identical from store to store, based on a standard recipe and ingredients. Then what do you compete on? Speed? Panache?

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