I tend to curate horror films for watching with my friend group because it's my favorite genre, here's some recent successes I've had for my group watches.
For movies that actually get good scares out of people:
Hell House LLC, It Follows, Gonjiam Haunted Asylum, Ghost Stories, Terrified, Banshee Chapters, REC, Evil Dead (Remake), Autopsy of Jane Doe
For "fun" horror that isn't scary, but just a blast to watch:
Dead Alive, Trick 'r Treat, Cabin in the Woods, Planet Terror, From Dusk til Dawn, I Am a Hero, Deathgasm, One Cut of the Dead