You know you're a nerd when...
...you and your friends/family play "guess that conductor" instead of charades.
...you look at a shampoo bottle and say, "Hey! There's a comma missing!"
...you look at the daily Google picture and you know what it's commemorating before you scroll over it.
...you fall asleep with textbooks in your bed and you don't notice until halfway through the next day.
...you quote Captain Kirk in real life and your brother laughs because he knows exactly what you're referring to AND he knows the name of the episode is that the quote is from.
...you think of every purchase in terms of how many songs on ITunes that would be.
...you know a random date that your teacher/professor asked for but didn't expect anyone to actually know and you can't remember how/why you know it.
...you play charades and the choices are: movie, book, tv show, play, and opera.
...you know the Dewey Decimal number of a specific subject.
...you talk about famous people by their first names and everyone knows who you're talking about.
...you can answer the questions on Jeopardy that the contestants don't know.
...you know who Petra is and what their greatest hits were.
...you have drawn out conversations about the meaning of Time and whether it actually exists or not.
...you don't notice that you're randomly adding phrases in foreign languages into your everyday speech.
...you have 43 books checked out and think nothing of it.
...you squee over a New York Philharmonic concert (and think that the first-chair cellist is cute).
...you're 10 years old and your role models are Nancy Drew and an android named Data (Star Trek TNG).
...you can read three different alphabets.
...you know the date of every Mozart opera premiere but you can't successfully drive two miles without getting lost (in your home town where you've lived for over 10 years).
...you correct a teacher's/professor's grammatical mistakes when you copy down their notes.
...you're 12 years old and you want to be an astronomical geologist when you grow up.
...you visit three different libraries in the same day and think that it's normal.
...you use opera singers' names in the place of profanities.