Qft imo. I couldn't sleep comfortably for MONTHS! XD Imagine if I had seen the second which people say is scarier! O.oParanormal Activity is like, the scariest movie of all time. Seriously.
To me, there is a difference between a scary movie and a horror movie. Scary is human being dressed up in a costume trying to kill people, i.e. Scream, Texas Chainsaw Massacre, Friday the 13th. Even movies with a lot of gore and blood aren't scary, just gross. Demons and possessions is true horror to me!