Criminals and crime (not just serial killers)
Ham radio & SWL
Firearms
Books
Woodworking
Pirates
When I get interested in anything, I read EVERYTHING I can find, print off page after page from the internet, buy books & etc. For instance, I saw a very young girl on PBS playing a dulcimer and she was very good. She said it was simple to play, so I decided I wanted one. I researched them, checked out ALL the books the library had that mentioned them, bought every book I could find and went to every website I could find about them, and decided I would build one. I had to buy and make a lot of special tools and jigs to do it. I built one, in fact the first one I ever held in my hands was the one I made. After all that, the reading and money and work, I played around with it for a few weeks, learned a few songs and hung it up over my chair where it is today. Then I found something else to be obsessed with...