The Film: Arsenic and Old Lace
The Director: Frank Capra
The Cast: Cary Grant, Priscilla Lane, Raymond Massey
Release Date: September 23, 1944
OK, this isn't a horror movie. You got me. But it's set on Halloween, and it's one of my favorite movies ever. It talks about Karloff a lot and features murders, mad doctors, plague victims, and dead bodies in window seats. And it's hilarious. So you should watch it, even if it's not a horror movie.
I mean, if Teddy can't make you laugh, check your pulse.