I just found this thread, what a great idea!
I'll post what I've seen so far, most of it broadcast on cable TV, watched while working from home. I'm not adding links for most of these, as they're pretty well known, so I'm assuming that most (if not all) of the posters here have seen them already.
The last one I watched, I will give a description and link.
01. Friday the 13th (1980)
02. Friday the 13th Part II
03. Friday the 13th Part III
04. Friday the 13th Part IV (The Final Chapter)
05. Friday the 13th Part V (A New Begining)
06. Friday the 13th Part VI (Jason Lives)
07. Amityville Horror (1979)
08. The Conjuring
09. Insidious
10. The Exorcist
11. The Shining
12. The Crazies (2010)
13. Trick R Treat - Trick 'r Treat is a 2007 American anthology horror film written and directed by Michael Dougherty and produced by Bryan Singer. The film stars Dylan Baker, Rochelle Aytes, Anna Paquin and Brian Cox. It relates four Halloween horror stories with a common element in them, Sam; a mysterious child trick-or-treater wearing shabby orange footie pajamas with a burlap sack over his head. The character makes an appearance in each of the stories whenever a character breaks Halloween traditions.
https://en.wikipedia.org/wiki/Trick_%27r_Treat