My top 21:
A Clockwork Orange.
Dirty Harry.
THX-1138.
The French Connection.
Play Misty for Me.
The Andromeda Strain.
The Cat O'Nine Tails.
Willy Wonka and the Chocolate Factory.
The Omega Man.
Shaft.
Duck You Sucker aka A Fistful of Dynamite.
Four Flies on Grey Velvet.
The Abominable Dr. Phibes.
Willard.
The House that Dripped Blood.
The Begulied.
Diamonds are Forever.
Bay of Blood aka Twitch of the Death Nerve.
Bedknobs and Broomsticks.
Let's Scare Jessica to Death.
Harold and Maude.