what the hell do you need a demo for?
have they added complex new rpg/rts elements to it?
is it now an airline simulator?
NO! its a F%^&ing ZOMBIEE GAME!
just need to write on the box:
"you are the only person who's not a zombie, you use this array of weapons to make it so your the only person who isn't a bloody pile of gibs!"
unless its the Australian version, in which case it would be more like:
"you are the only person who isn't living impaired. use strong words and your safety whistle to make all the bad people go away, so you can escape back to reality where no one ever swears, uses drugs, where blood doesn't exist and No one would ever even think of having sex, cause babies come from the hospital!"