I heard a story last night at a friend's birthday party...
Barista Thad was working the drive-thru at the Starbucks down in Cool Springs (Franklin, TN), a consistently busy store and drive-thru. He had already been having a stressful time with some cars coming through when a lady pulled up to the window and said to him, "Hurry up!" The tone and words must have pushed him over the edge, as he tilted his head, smiled and slowly said, "OK!" From there, he wandered to the register to cash out and meandered over to the bar to get her drink, before strolling back to the window with it.
It might not be Starbucks' "Legendary Service," but sometimes it keeps a barista from throwing the drink out the window at rude customers.
Note to Starbucks customers: It's oftentimes faster to go inside the store than to go through drive-thru.