You get the saw blade and you keep throwing it at the zombie until it slices his hand off
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Use the stapler
You have to keep throwing the zombie brain at him until he catches it.
Shotgun, Pistol, and hand axe is the best minimal combo for stopping power and decapitation. Under only absolute last resort circumstances should combustibles (such as flamethrower, hand grenades, or any fuel based weapon) be used. Along with this you can have a butcher knife, the shovel (no zombie can stand against a shovel) or may be a hammer you can use to kill a zombie.
You have to combine zombies in the zombie pot
In creative mode you can spawn a zombie with the egg