Sonic Zombie Lure

Very basic idea, no diagram. You find one of those annoying singing birthday cards, tie a string to the front flap and place a very small rock on it. Run the string in the likely path the zombie would take. When it trips over it coming to you, it will instead be drawn to the card that is now playing crappily encoded birthday songs. This will give it a new target, and you a warning that there's one nearby.