Alien to me is a watch once a year kind of film, but that Vent scene is really uncomfortable to watch because it's really scary.
I recently watched The Human Centipede 2 with a buddy for ****s n giggles, but damn that movie was hard to watch near the ending.
I've seen a lot of gore and I don't mind it cause usually it looks really fake, but damn this movie was just....gross. I would never watch it again because it was THAT gross, but it was fun to watch with my buddy and be that terrified aha.
TBH, it's a good film when your with a friend or a group, hell even a party, but by your self it'd just be weird. Like one of those "why am I watching this" kind of films.