How to know if you're a dork...

5. You attempt to calculate profit margins for every service you consume.
4. You ponder the opportunity costs of thinking about opportunity costs.
3. Your idol is Milton Friedman.
2. You hide your Introduction to Stochastic Processes book inside your Compreendo Trabalho para Transforma-ló book, so you can read it during class.
1. You "chat" with your Computer Chess opponent to try to find a weakness.