I have a couple of anime-related stuff:
Earliest was
Akazukin Chacha, the first anime I watched obsessively. As it is an anime for young girls, I'm sure that counts as a rather embarrassing admission (in my defense I was 12). I was obsessed enough to have plotted out a 50-part fanfiction that would continue the story. Ultimately life intervened, and I think I finished only up to 7 chapters of the tale. Fortunately, the death of Geocities has consigned that part of my internet history to the dustbin of time - for the life of me, I can't remember the URL anymore to even search in the Wayback Machine. There's a 1 TB Geocities torrent out there, but I don't feel like sifting through thousands of sites in \Tokyo just to find a crappy fanfic.
Ima, Soko ni Iru Boku (Now and Then, Here and There) really haunted me, as I'm sure any anime with children being shot to death would. Haunted enough to make a really crappy screencap site on Fortunecity that's still
online. That was the maximum extent of my obsession, because it was a really short anime.
My next foray into being a fanatic fan was with Justice League. (Yeah, it's not anime but who cares.) Due to a quirk in scheduling, Cartoon Network Asia aired Season 2 episodes weeks before the U.S. premiere. I had a field day
teasing the folks at the Toonzone forums with spoiler screenshots. The
peak of their envy was when Starcrossed, the series finale, aired in Asia ahead of time.
Finally, we have
Chuuka Ichiban!, or Cooking Master Boy, which I was obsessed enough to complete a
one-man transcription project for it, a few months back. That project took 2 years from start to finish (and it's not done yet). Still, the first signs of that obsession sprouted much earlier, when i made extensive summaries of a few filler episodes. I have
preserved this, although an
ad-laden version on FortuneCity still exists online (I have forgotten my login details). Strangely enough, it's receiving inbound links from a chicken appreciation society!
Jam it back in, in the dark.