Salo, or the 120 Days of Sodom (1975)

Original Title: Salò o le 120 giornate di Sodoma
Imdb: Four fascist libertines round up 9 teenages boys and girls and subject them to 120 days of physical, mental and sexual torture.
Imdb Rating: 6.0
Language: Italian, Italy

HL Rating:
Plot: 4, Pop-ups: 0, Twisted: 5, Acting: 5, Gore: 4, Creepy: 2, Special Effects: 3

The Blair Witch Project (1999)

Imdb: Three film students go missing after traveling into the woods of Maryland to make a documentary about the local Blair Witch legend leaving only their footage behind.
Imdb Rating: 6.3
Language: English, USA
Cast:  Heather Donahue, Michael C. Williams, Joshua Leonard

HL Rating: 
Plot: 3, Pop-ups: 2, Twisted: 1, Acting: 3, Gore: 1, Creepy: 2, Special Effects: 2

Cannibal Holocaust (1980)

Imdb: A New York University professor returns from a rescue mission to the Amazon rainforest with the footage shot by a lost team of documentarians who were making a film about the area's local cannibal tribes.
Imdb Rating:5.9
Language: English/Spanish, Italy

Cast: Robert Kerman, Francesca Ciardi, Perry Pirkanen

HL Rating:
Plot: 4, Pop-ups: 1, Twisted: 4, Acting: 4, Gore: 4, Creepy: 2, Special Effects: 3