Not-A-Zombie

Not-A-Zombie isn't smart, but isn't the dumbest one either. It holds a boards saying "Not A Zom-Bie". Because of this, your plants would think its not a zombie. So, they will not try to attack it. The only way to kill it is by making your plants attack it by accident and destroy the board. How to do it? Lets just say; Not-A-Zombie is heading towards your house, and your plants don't attack it. But, another zombie spawns behind it so they accidentally shoot the Not-A-Zombie as they actually want to kill the zombie behind it. But, the best way is by using Explosive Instants or Squashing a crowd of zombies with a Not-A-Zombie in it. It will pass through plants and chompers will not try to eat it.