The first legit 18 cert I saw in the cinema was Alien 3. Not the greatest time I've had in the cinema, but getting to see Peter Jackson's Braindead on the big screen shortly after made up for it. Now, that was a feast for the eyes. I went with my my uncle (who's only 7 years older) and it went right over the top of his head. In fact, he hated it. I guess it was just a bit too much for him.