The Exorcist was quite funny IMHO. I just couldn't see what was so scary about it. I remember watching it with a friend in a cinema pissing myself with laughter and everyone else was in terror. Especially that 'your mum sucks c*cks in hell' line! Absolutely hilarious!!!
I remember as a kid being scared of 'Aliens', but having watched it again recently I was left rather cold.
I suppose the Blair Witch Project was pretty creepy because of its unique perspective (although I was quietly hoping that annoying chick was going to get her comeuppance!!!)
I used to think the brain is the most fascinating part of my body. But, hey, who is telling me that?