Supposedly the most famous British atrocity story concerning the Germans during World War I was the "Corpse-Conversion Factory"-rumor; it was said the Germans produced soap out of corpses. A story, which got so well believed that it was repeated for years - without a clear evidence of reality at that time. (
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In November 1997, after the assassination of (above all Swiss) tourists in Egypt, the Swiss newspaper Blick showed a picture of the place where the attack had happened, with a tremendous pool of blood, to emphasize the cruelty of the Muslim terrorists. In other newspapers the same picture could be seen - with a pool of water, like in the original. Of course the manipulated coloured version of the Blick fit better into the mind of the shocked Swiss population. The question about death penalty arose quickly ....