Have you ever met someone who is blissfully unaware of seemingly everything around them? They're the type of person who floats through life with an empty head, and is often surprised when you correct them about common facts . We have a lot of love for our dumb friends, although we may have less tolerance for dimwitted coworkers. When your friend says or does something silly, it becomes an inside joke. But when a coworker acts brainless, you start wondering if they make more money than you, or i…