I see lots of people saying they're fascinated with serial killers. I think most of them tend to be girls. I guess a lot of people are into true crime too insofar as they want to get into forensics.

I'm interested in the grammars of other languages, theoretical physics, how color vision works and the physics of light bouncing off objects, things like specular highlights, metamerism, etc. etc.

Do you get the ID channel? It's like murder overload. I get into it sometimes, but I have to take a few days off because I'll be convinced I'm going on a date with the Back Bay Black Widow.

Anyway, as stated a few answers ago I'm a huge geography nerd and 99% of people completely zone out when I start in about the breakup of the various Balkan states

I believe many are, including myself. Maybe not facinated but I find them very interesting. I am interested also in reaching the state of Nirvana. Most people know this word but I am sure they cannot explain what it really means.