Horror movies have to really stick the landing to last. Whether that means coming in with a surprise twist, or an explosive event, or even a maddening cliffhanger, the final moments of any good thriller should bring together all the jump scares and eerie elements that have defined the rest of the movie. For these modern flicks, the third acts were so good that they'll easily stand the test of time. Let's take a look at the best horror movie endings of the century so far. And don't be scared, but there are huge spoilers ahead.