As I walked through the front door of the Post Office to make my stamp purchase, I was faced with a choice. On my left was a vending machine, and to my right was the customer service desk, where I could make the purchase from actual human beings. Because there was no line at the moment, I chose the human interaction. I strolled up to the middle-aged, slightly balding postal employee, read that his name was "Rex", and I asked for two books of stamps. As it was mid-December, Rex asked me "would you like Christmas stamps, or...". Once I realized he wasn't about to complete the sentence, I looked down and saw that he was holding some very un-Christmas-like stamps bearing images of the Liberty Bell and the word "Forever." Knowing that my wife had planned to mail several Christmas cards, I told him "One of each." To my surprise, the decision-making did not stop there. Rex hit me with a follow-up: he held up two types of stamps: one had a pi...