I think people who are not truly cerebral types of movie fans, obsess about spoilers and while maybe that's relevant in a Scream movie or something like The Sixth Sense, most great movies aren't really able to be spoiled, because they aren't constructed on shock value plot twists, when I think of the movies I love the most, it's near impossible to "spoil" them with fairly vague or generalized plot twists. Obviously, if someone gives you a full on detailed run down, it may take some enjoyment out, but usually people are all worked about some fairly minor plot point. "DONT RUIN IT FOR ME"