Halloween III: Season of the Witch. For anyone old enough to remember the reception that SotW recieved back in the day, it's kind of mind-boggling to see the (still growing) fan following it commands today.
SotW was a movie I had skipped seeing for years, simply because it had such a toxic reputation, but when I finally saw it on TV in the late '80s, it really jumped out at me as being a cool little movie with a funky sensibility. The bait and switch by Universal was truly kind of bullshit but over time the movie has had a chance to be judged on its own merits.
Even with its improved reputation, however, the love for SotW is by no means universal. Some fans are still pissed that this doesn't have Michael Myers in it. Seeing as there's been, like, seven movies since SotW with Michael in them to still be upset about the one movie that didn't include him seems, um, I don't know - deranged, I guess.
Anyhow, I really dig the movie. I hope you do too.
And in honor of the insidiously addictive Silver Shamrock commercial, I'm posting some of my favorite retro Halloween spots.