Every year around Halloween, people dress up as ghosts, ghouls, goblins, and other ominous creatures and prowl the streets in quest of candy and a few good scares. Unfortunately, in the world of SEO, dangers lie in every corner of the web regularly, traps that can lead your site to tumble in the results or, worse yet, completely disappear from the SERPs. Of course, the frightening aspects of Halloween only persist for one evening, but a search engine penalty might have long-term effects.