Can't watch them, mostly they're just laughable like the scary ride at a two bit traveling carnival where stuff jumps out at you every time the car jolts suddenly to another direction. Have never seen Halloween, or Freddie Kruger, Scream, Nightmare films - I did see the Texas Chainsaw Massacre (for about 20 minutes)
Lots of good horror films that could be categorized as slashers
Black Christmas (I guess this is considered the first true slasher film - possibly the best of them all - filmed in Montreal)
See no evil - (Mia Farrow)
Hush Hush Sweet Charlotte - definitely a horror film
Die Die my Darling - not sure what it would be, but it scared the crap out of me. Haven't been able to watch it since I was a child.
A Made for TV film - House on Green Apple Road was truly disturbing.