The original Fly which I saw in the theater as a kid when it came out left a lifelong impression on me. Mainly the last scene, where Price is sitting on the park bench, and hears the faint "help me, help me", and then we see the spider, etc. Still gives me shivers. The remake could never recreate this for me, perhaps fortunately.

I do however think that the Sutherland Bodysnatchers and the later "Thing" are the better movies.