Anyone else not know it was remade?

Home sick today, I saw Cabin Fever on HBO. I thought "oh yeah, that was a good movie, I'll watch it again." I kept thinking "hmm, this part seems slightly different, but maybe I'm remembering it wrong." It wasn't until five minutes ago, when I got on IMDB to read the trivia, and I realized it was a remake of the movie I remembered. I see a lot of threads addressing the fact that a remake was unnecessary, and I agree. Just wondering if anyone else actually didn't realize they were watching a remake!

P.S. No, the irony was not lost on me that I was watching this while home sick. Admittedly, it was a strange choice.