Added Pet Semetary. I guess you meant Cannibal Holocaust, also top-5 material from this list for me.
I've got The Shining and Videodrome as easy picks, but after that The Thing, Possession, Cannibal Holocaust (and I'd add Amityville II: The Possession to the mix) can go 2-6 in pretty much any order.
Oops, yeah meant Cannibal Hollocaust, thx.
I don't remember Amityville II: The Possession, but I'm sure I've seen it. I'll have to get and dig that up somewhere.
Also, just finished (like 2 days ago) binge watching The Nightmare on Elm Street 1-7 movies. A couple of things on that, is that the first 5 were made one year apart from 1984 to 1989. That has to be a record for fastest first 5 of a franchise. The first 6 were made in 7 years (also possibly a record), and the first 7 in 10 years (maybe a record too).
Beyond that, I found the first 4 enjoyable, with the original being probably the best still (a common trait of franchises). I also forgot Johnny Depp was in the original, which was cool (he acted well as usual). But after that the franchise got annoying to me. It went from being relatively easy to follow with decent scares here and there, to completely convoluted, self-aggrandizing, bad CGI-reliant, poorly constructed plots taking bits and pieces from past episodes, and on on I could go. But, I suffered through anyway. Kind of glad I went through them as I'm not sure I watched every one before (except the final two, which I have seen). Anyway, I digress.
Oh, and btw, I actually liked the Pet Sematary sequals, particularly Pet Sematary II from 1992.