In the wee hours of the morning, under the cover of darkness, they creep. Their flip-flops smack across the pool decks of cruise ships everywhere as they shuffle like a horde of zombies armed with towels, sunscreen and books. If it sounds like a scene from a horror movie, you're on the right track. We're talking about deck chair hogs -- those inconsiderate fellow passengers who rise before the sun to stake out prime poolside real estate, mark it with personal belongings and then abandon it, rendering it useless to others. If you've had enough, we urge you to stand up to these selfish sunbathers and claim the deck chair that's rightfully yours. Join the peaceful revolution by employing the following seven tips for outsmarting deck chair hogs.