I do not really know why, but zombies have become very popular. There are games where you must kill the zombies, there are films where the zombies are taking over entire cities and you can not save yourself, there are occasions where a lot of people dress up as zombies and just walk around or looking for people to eat up. I do not know where this obsession for these creatures have come from. Maybe it's a bit like with the aliens, "what would happen if it actually would be zombies all over the earth?" I have a book where there is a chapter that explains very carefully how you should do to have a chance of surviving a zombie attack.