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The milkshakes at Black Tap Craft Burgers and Beer have become so popular, people are willing to wait hours in line for a drink they can finish in minutes. But are these people legitimately crazy or is there a real psychological reward involved when waiting in line? Zagat editor Billy Lyons decided to find out for himself with the help of Dr. Gail Saltz, a Clinical Associate Professor of Psychiatry. Are lines a waste of time, or do they actually help make the experience better? For more videos, subscribe to Zagat on YouTube here: http://goo.gl/AaWZHT