I love trailers that fool the viewer, by making it look like they're showing spoilers, but they're not (they're showing about four different scenes together, but it looks like one scene being spoiled if that makes sense) a dying art, as a lot of trailers do spoil these days.

A good example is Final Destination they make it look like they're giving away the deaths, but they're not (even though sometimes they do actually reveal at least one death).