There's nothing wrong with being a nerd or being smart. While being a nerd in high school used to be a one-way ticket to wedgies and swirlies, nowadays the smart kids tend to be treated with more respect. And, in some circles it's even cool to be a nerd. Plus, if anyone does ever give you hell, just remember that it's the nerds who end up with the good jobs and comfortable lifestyles. Now, if you want a little bit of nerd humor to brighten up your day, here are eighteen pictures that you have to be smart to understand. Check them out!