Or just, weird things in general?
I've always had my one positive obsession, for the past five years it has been the music that I listen to, and I don't ever want that to change.
Accompanying that, I've always had a shorter-lived "negative" obsession. One that I cannot stand to think about. One that makes no sense at all, and that I hate.
For example... When I was about 12, I noticed that my neighbour had a really weird nose. I thought about it for a while, and the image of that particular nose became engraved in my brain. Within the next few days, I became obsessed with his nose, and then it evolved into an obsession with noses in general. This obsession lasted around a year, running parallel to my positive obession of Pokemon, although Pokemon lasted two years, and overlapped yet another negative obsession, over hiccups.
I do not learn about my negative obsessions on purpose, but I retain any knowledge I learn about them. I don't want to think about them like I want to think about my positive obsessions, I just end up thinking about them. They're stupid, annoying, weird, and shameful. (Why would anyone enjoy being obsessed over noses or hiccups?)
Before you suggest obsessive-compulsive disorder -- no. This is almost the same as my positive obsession, except it is negative and I hate it.
Also, assuming I am not a total freak, does anyone have any tips to help me get over my negative obsessions? It annoys me that I have them.