Guilty. Ironically, I'll periodically obsess over whether I have AS in the first place, since I'm still trying to get an official diagnosis. I'll spend countless hour for days at a time reading up on it, take a break, then end up falling back into it. It's stupid, since I'm already approximately 97.8% sure that I have it anyway, but I can't help it. I have to know for sure, somehow.
Also, when Jurassic Park first came out and I was really young, I was OBSESSED with it. I had many of the toys, and even long before the movie I'd already been obsessed with dinosaurs themselves. I was probably among the few fans of the movie (both kids and adults) who knew that, in reality, dilophosaurus didn't actually have the neck frill, nor did it spit venom. (Come to think of it, I guess few people would be aware of that even today.)
Anyway, that obsession lasted for years, then fizzled out for reasons I don't recall. But then, several weeks ago, I finally saw the movie again, and I've been constantly obsessed ever since--not so much with the dinosaurs themselves, but with the movie as a whole. I listen to various songs from the soundtrack (or the entire soundtrack) pretty much every day, and I know a lot of the cues in the soundtrack for events in the movie, some of which I playfully reenacted for my little cousin just a few hours ago. I've since watched the movie once more as well. I guess that doesn't entirely fit into the category outlined by this thread, but I just wanted to say it.