the first time I saw The Shining, Poltergeist, and The Exorcist, they were all though livestreams a friend was doing and I had a great fucking time because (1) they are fantastic horror films, (2) my friend is a big horror fan and my reactions to stuff were exactly on point for what both movies were trying to do, so she got the enjoyment of seeing me hit those moments and I got the enjoyment of sharing the movies with her, and (3) as both went on we talked about why both movies worked so well and how they worked well compared to other movies. We'd also watched Jack Frost (the terrible family film, not the horror film) right before watching Poltergeist, so we had some choice words about how Poltergeist was much better at actually bothering to make the characters likeable.
we also had the added bonus of her trying to look up screenshots taken of the split-second demon faces in The Exorcist, and got so frustrated with google not getting her what she was looking for that she typed "THE ONE WITH THE FACE AND SHIT" into a google search, and the result gave her.... the IMDB page for Pulp Fiction.
The first time I watched Robocop it was with a friend who'd seen it before, and I was so excited about how much stuff was going on that I kept talking about it and then getting mad I was missing stuff because I was talking, and she got to learn new stuff about it because I was catching all the stuff about the 80s it was parodying that she hadn't caught that before. I got to replicate the experience when I showed it to a friend and she had her mind similarly blown over it.
The first time I saw eraserhead it was with several friends and their friends, and unfortunately the friends of friends were kind of the worst people to watch it with because they kept asking questions about what things were supposed to mean, but it also led to the most hilarious moment of the night when we got to the scene where Henry started cutting the wrappings off the baby, and one girl turned to her friend who had been asking question the entire time and said "okay, this will explain everything"
The room descended into silence until the credits rolled, and her friend said "...that explained nothing". I laughed and said "and you BELIEVED her!"