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"His moustache is the most instantly recognisable - and sinister - in history.
Yet, according to new research into Adolf Hitler's early life, the distinctive, toothbrush shape that adorned his scowling face was not his first preference.
A previously unpublished essay by a writer who served alongside Hitler in the First World War trenches reveals that the future Führer was only obeying orders when he shaped his moustache into its tightly-clipped style. He was instructed to do so in order that it would fit under the respirator masks, introduced in response to British mustard gas attacks.
Effects? Chaplin's *The Great Dictator* is still possible, of course, but without the similarities in their moustaches it loses an obvious hook for the audience...