We all know zombies aren't real, right? But, come on. If one approached you, looking pretty realistic, you'd undoubtedly either run off crying or swing at them with the nearest item-turned-weapon.
Zombie pranks are nothing new, but I love this one. I find it both remarkable and hilarious that some people seem totally convinced, in a moment of adrenaline-supplied survival instincts, that this zombie is not some cosplaying prankster.
My favorite is the girl laying on the grass, who—while screaming—gathers her things before running off. If you watch the deleted scenes, you'll see she was very creeped out. The zombie-player had to take his mask off to calm her down.
And remember, the best weapon against a zombie is to throw literature at it!