Had to really stretch to come up with 20 horror movies I have even seen
1) Evil Dead 2
2) Halloween
3) Halloween 2
4) Backula
5) Army of Darkness
6) The Shining
7) Killer Klowns From Outer Space
8) Prophecy
9) Prophecy 2
10) Silent Night Deadly Night 2
11) Puppet Master
12) Friday the 13th
13) Creepshow
14) Prophecy 3
15) Puppet Master 2
16) Jack Frost
17) House on Haunted Hill (original)
18) Shaun of the Dead
19) Zombieland
20) It