a VERY scary-horror movie for 15 year olds!?

ok soo im having a sleepover with a friend and best-friend if the movie isnt "so-scary-that-i scream-out loud" then its ok, i'll give you example of scary for me; - Grave Encounters (the first one) -paranormal activity (all) horror movies i thought were good; Insidious, the haunting in connecticut (the first one), VHS!! and VHS2 i know there are others, i just an't think of any so tell me others, and PLEASE dont mention the ones that are "known" or popular or went to the cinemas cause i OBVIOUSLY know about it and dont want to watch it thx