You know you're a Harry Potter nerd when you have read the books so thoroughly and memorized so many random facts from JKR's interviews that you can act as a walking, talking HP dictionary to the horror of your friends and family.
SO. VERY. GUILTY.
I do this online too. And especially when I'm reading fanfiction (I am a so called "canon police"wink. I always reference just to be sure I really got it right of course but the last 6 months or so I've had 95% accuracy and improving.
I scare myself. Why can't I take my university studies this seriously?? gonk