I have always hated this, a zombie or zombies would come through a door unseen by the victim and attack them, killing and eating them if i make a zombie video/movie, i am not going to do this to any of characters...
Gah, I hate when that happens in movies. How can a zombie sneak up to a person unseen! Isn’t it supposed to moan first before attacking the victim? Unless the vocal cords are missing or filled with blood its impossible for the zombie to just sneak up behind a person unseen.
I hate this scene. It's stupid. Zombies do not plan. They do not hide and wait. They are very slow. Individually, they couldn't do much damage. Its their numbers and their willingness to take all damage that makes them deadly.
I could do it and pull it off. You just have to believe there is a reason that zombie managed to get up on a guy. Really, have you even pondered how bad they would smell? You would know it was in the room with you if it was anywhere past a day old, Infected or Undead.