Arsenic and Old Lace (The couple marries on and the action takes place on Halloween!)
Scooby Doo Halloween specials (we watch this and the animated stuff while carving pumpkins)
It's the Great Pumpkin, Charlie Brown
Monster House
Nightmare Before Christmas
House on Haunted Hill (both original and remake)
Frankenstein
Bride of Frankenstein
The Mummy
The Wolfman
Hold That Ghost
Abbott and Costello Meet.... (all of the monsters)
Creature From the Black Lagoon
Cabinet of Dr. Caligari
Nosferatu
Susperia
Evil Dead (all 3)
Dawn of the Dead
ALL OF THE HITCHCOCK MOVIES!!!
Mad Monster Party
Hammer Pictures: Curse of Frankenstein, Horror of Dracula, etc..
Halloween
House of Wax (1933 and 1953 versions)
An Amercian Werewolf in London
Jeepers Creepers
Texas Chainsaw Massacre (original)
The Thing
THEM!
and sooooo much more that I'm forgetting. Dh is a movie collector, so we have tons of movies, especially the horror/suspense genres