My least favorite customers fit this description: He or she will give you the incorrect title of a book. It's invariably something that doesn't sound the least bit familiar so you can't make an educated guess as to what the real title is. While you're looking it up, the customer will yammer on and on, repetitiously, about the subject matter of the book. ("It's full of pictures of MRIs showing the brain before and after drug use. Both before, and then after, using drugs. Pictures of what the brain looks like. Taken with an MRI.") When you explain that you cannot find a book by that title and that you'd be happy to do a little more research to figure out what it is, the customer says, "That's great. Thanks!" You spend five to ten minutes trying to determine what the hell this book is. When you can at last turn to the customer to reveal what you've learned, you discover that he or she has left the store.
Happens to me at least once a week. The end.
All of this has nothing to do with Mr. Obama, of course.