Since it was first published by Image Comics back in 2003, The Walking Dead has become a pop culture phenomenon, spawning a range of successful novels, video games and even action figures. However, all of that pales in comparison to the success of the TV adaptation, which has become the most popular show in the US among the highly coveted 18-49 demographic. The premiere of season four was watched by 16.1 million viewers, making it the most popular opening episode the show has received yet. Who would have thought a black and white comic book about zombies would have become so popular? A new trailer for season five was recently unveiled at Comic Con and the response was overwhelmingly positive. With rumors circulating that more major cast members will be shot/eaten/disemboweled in the new series, anticipation is at an all-time high for the programs return on October 12th. Think you know the series like the back of your hand? Think again. To celebrate the success of the show so far, read on to discover 25 facts you probably didn't know about The Walking Dead. Memorizing each of these obscure references and random bits of trivia will dazzle all of your friends and help you to win every Walking Dead pub quiz there is. That's going to be a thing one day. Trust us... Just remember that spoilers will inevitably occur here, so if you're not up date with the latest season, take a day off work and watch every episode in quick succession. Caught up? Great! Now read on and remember to let us know if you have any more facts that fans of The Walking Dead would love to hear.