I'm going to agree with you about Event Horizon.

I honestly think that the best bad movies I've seen have all been ones where it actually wasn't about the movie at all, but rather was about the company. We had a hell of a time watching (I think?) Jeepers Creepers. It wasn't a hilariously bad movie itself, but it just had a whole lot of opportunities where you could yell at the characters for being idiots, and we all seemed to be in the mood for that at the time, so much yelling was done.