got 27 in 20 minutes
major spoiler below - full list of answers
1. Stairs - 39 Steps
2. Two blokes on the stairs - The Grudge
3. Lady with two kids - The Mummy
4. The Knife - Blade
5. Letters burned in the field - Friday the 13th
6. Corn on side of building - Children of The Corn
7. Signs at the top of the stairs - Signs
8. Sheep around the knife - Silence of the Lambs
9. The Jaw - Jaws
10. Red M&M with coins - Sixth Sense
11. Green M&M - Blue Velvet
12. Blue M&M - The Ring
13. Pumpkins - Halloween
14. Ripped cloth with map of texas - Texas Chainsaw Massacre
15. Bloke in the Window - Rear Window
16. Large Fly - The Fly
17. The Mountain - Twin Peaks
18. The Candle House - House of Wax
19. The Village nearby - The Village
20. Bloke with a pumpkin on his head - Pumpkinhead
21. Grim Reaper in the circle fence - Dead Zone
22. Monkeys - 12 monkeys
23. Bloke with a candy head - Candyman
24. Dark Cave at the bottom right - Pitch Black
25. Floating hat and glasses - The Invisible Man
26. Bloke with a basket on his head - Wickerman
27. Black Crow in the tree - The Crow
28. The Butterflies - The Butterfly Effect
29. Bloke in the Straight Jacket - Psycho
30. Fish - Piranha
31. Bloke above the fish - Scream
32. The Wolves in the Field - The Howling
33. The Girl with the barrel of water - Dark Water
34. The men with 0 on their shirts - The Omen
35. Bloke on the bed - Nightmare on Elm Street
36. 7 on the wall - Seven
37. The Alien in the Tower - Alien
38. 3 Blokes looking at a map - The Lost Boys
39. Orange with Clock Hands - A Clockwork Orange
40. The Big Baby - Rosemary's Baby
41. Bloke with the Lantern - The Shining
42. Thin bloke on the bottom right - Eraserhead
43. Children Dancing - Childs Play
44. The Beetle in glass bottle - Beetlejuice
45. Creature in the water at bottom left - Creature From The Black Lagoon
46. Saw in the tree - Saw
47. Shortarse bloke in tree - Leprechaun
48. Hill in the background with glowing eyes - The Hills Have Eyes
49. Birds above the house of wax - The Birds
50. The Two Planets in the Sky - The War of the Worlds