DECAPITATION
The only way to kill a zombie is to destroy the brain (see Brain) and it is a common misconception that decapitation does just as good a job. Chopping off a zombie’s head does stop it from advancing towards you because it has no body – but it does not kill the zombie. What you have left is a zombie head that can still infect you – as it can still bite. So although you have technically neutralised the threat, do everyone a favour and finish the job. It will only be a matter of time before you forget you had that head in the corner and you stub your toe on its teeth. Or it could pull itself along by its chin until it manages to reach you while you are sleeping. And if you are lying down with your legs spread, heaven knows where it might choose to bite! Decapitation may seem like fun, but not when you have a severed head attached to your gonads. Destroy the brain.
Also note that it is unwise to collect zombie heads to create your own puppet theatre.