I've seen some movies not knowing anything about them by avoiding trailer (this being much easier in the 1990s...) Movies seems to work better that way.
Though it can be jarring: Eg. Silence of the Lambs or Leaving Las Vegas.
I avoid trailers like the plague. When reading reviews I'll skip most of it. I want to know the gist of the plot, and I want to know the summary.
I enjoy movies so much more this way. Sure, sometimes I end up watching some duds, but most of the time I'm really engrossed and I love the surprises.
If I watch a trailer, especially the modern 5-minute condensed versions, I find it takes away >90% of the excitement. Doesn't matter if the movie comes out next year, the trailer will come back to me and I will recall the spoiled plot points.
I heard once that this is because the creators of the trailers are separate entities from the movie studio. Their job is to sell the movie. They don't care if they have to spoil the whole movie to get you to buy a ticket to see it.
I can usually tell within the first third of a trailer whether I'd like to watch it. In those cases I don't finish the trailer. They give everything away.
Yeah. Sometimes I've wanted to check out a new film on Netflix. I watch the tiny trailer that runs in the app, while I figure out whether it is worth my time.
Trailer ends, and I know all I need to know about the film. The plot is known, the story is more or less obvious. Pick another film, repeat, same thing.
Result: do something else entirely, or watch comfort series like Star Trek, where it doesn't matter that I remember the plotlines.
Though it can be jarring: Eg. Silence of the Lambs or Leaving Las Vegas.
The Onion had a good take on it:
https://theonion.com/wildly-popular-iron-man-trailer-to-be-a...