Migraines

Migraines are caused by minuscule zombies who rip and devour pieces of the brain they inhabit. Feverish minds, troubled by headaches and hallucinations are able to draw them into horror stories which flock our eyes in the cinema.

Some activities which the host performs wakes the voracious zombies and as the host tries to survive the unsuspected attack on the head, and believes the vomiting, the repulsion to noise and smells, the semi paralysis and shaking, the fear of light, are all caused by something as trivial and normal as blood rushing to the brain or a huge hangover. So then the host growls grr argh, takes enormous quantities of pills, and tries to sleep.

And the zombies munch away...