For me the problem with spoilers is not about knowing what is going to happen. A spoiler primes me to be on the lookout for when the spoiled thing happens, and

For me the problem with spoilers is not about knowing what is going to happen. A spoiler primes me to be on the lookout for when the spoiled thing happens, and THAT is what most ruins the experience for me. Of course a great movie can't fully rely on a plot-twist as it's central supporting structure, but it can be a nice spice that can get entirely muted by a spoiler.