Geeks - they're the easiest things to spot in public. By observing physical details and manner of dress, you can pretty much tell EVERYTHING about anyone you happen to see walking by. And no one falls into such stereotypical attires as geeks (aka nerds who "like stuff a lot"). Remember - always judge a book by its cover. Your adherence to stereotypes and conviction that no one can have interests that differ from your perception of them is pretty much always 100% right.
Here's a guide that will help you avoid those dingus geeks at all costs by identifying them from afar.