Drop Tower (was still Drop Zone when I rode it).
I rode it once in '05, and then tried it again in '06. I put it in the same category as Delerium and Invertigo. I wasn't terrified on them, just glad when the ride was over and I could get out of it. I really enjoy roller coasters, and find the fear/exhilaration trade-off to be worth it. Those three rides just aren't fun for me.