As a young teenager I absolutely loved reading Point Horror books. My girlfriends and I would swap books with each other once we'd finished. They were so gripping and scary and I felt really old and cool for reading them.
I'd totally forgot about them until we went to a market on holiday and found a book stall selling some. I bought the girls one each, The Lifeguard and Hit & Run and they read them both within a couple of days. We're going to join the library and try to borrow some more so they can read the series.
From memory I think either The Fever or FunHouse were the scariest. Although the cover for The Snowman used to really freak me out ?