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Many intelligent people lack common sense.  For example, there are book smart people and there are street smart people.  Book smart people are great at following directions and are normally on time.  Book smart people are very precise and like things done a certain way, by the book.  Book smart people have a downside, however.  Book smart people lack common sense.  For instance, book smart people are usually so focused on completing a task by the book that they sometimes overlook a simpler, more efficient way of completing a task.  Street smart people, on the other hand, are basically the opposite.  Street smart people relish alternate avenues.  They find pleasure in completing a task under their own terms.  Both book smart and street smart people are intelligent in their own ways, but they both lack some form of common sense; therefore, many intelligent people lack common sense.