accidentally reveal spoilers that would work best as a surprise. Trailers have become so overladen that some movie fans have opted to avoid watching them at all out of an abundance of caution, which sounds like the opposite effect of what marketers want.
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And then there’s the full trailer for Danny Boyle’s “28 Weeks Later,” which is nearly two minutes long yet doesn’t give anything away — in fact, it gives audiences more new questions than answers. It’s a masterclass in movie trailers that keeps its cards close to the chest, only doling out the tiniest hints of the nightmare to come. The trailer for “28 Weeks Later” is almost guaranteed to leave fans wanting more, and that’s exactly what a trailer is supposed to do.