My Halloween favorites include the PT back to back. Unlike most scary movies where watch characters fear for their lives, the PT + the idea of having to watch all three in one setting literally makes me have to fear for my own life and sanity. A hell of a lot scarier than watchin Jason Vorhees hack campers to death.

And to shift back to seriousness,

Evil Dead 2 and Army of Darkness
The Last Man on Earth
Omega Man
Soylent Green

oh, and two others that are occasional fun this time of year, but definately not worthy of rewatching each year (in my mind at least)

Duel
Westworld