Yup, there were 3 horror-themed episodes of Dawson's Creek. And even if you are not a fan of the show, they are still pretty fun. The first one was in season one, it was kind of along the lines of Scream. Worth a watch if you are a fan of the Scream / I Know What You Did Last Summer slashers. The Blair Witch style episode was in season three, and it is the best of the three horror episodes. They also did one in season five, it was an anthology where each character had their own scary story.