"Do you remember your first really nerdy interest? What was it?"
Not quite sure if it would be considered nerdy or not but I was really into Ghostbusters back in the day.
Had the toy Proton Pack, the trap and a couple of the toys when I was a kid. I even had a tent you could put on the bed that was pretty cool (if not terribly easy to break). Up until my first wallet finally gave out in High School, I had my “Official” Ghostbusters ID card on me at all times.
I bet if I did a check, I still have them somewhere. = P