If you don't mind found footage grave encounters 1 + 2 are a hoot.
If you want something extreme there is this French film called. Martyrs that fucked me up for days
I saw the Grave Encounters movies. I loved 1 but 2 dropped off for me towards the end.
Which reminds me, I still need to watch Trick r Treat.
I might add Dead Silence onto the list because it's my guilty pleasure of horror movies.
Back to the Future 3.
Eh...