In 1803, a ghost haunted a cemetery in the Hammersmith district of London — locals believed it was the spirit of a man who had committed suicide. It wore a white shroud and had big, glass-like eyes, which makes it sound like a Pac-Man ghost, or a marshmallow ghost you might find in a kids' breakfast cereal, but this ghost was anything but child's play. Rumors spread that an elderly woman and a pregnant woman both died of fright the night after encountering it. There were many non-lethal sightings too.
When a nightwatchman gave chase to the ghost, he witnessed it shed its shroud to run faster. After this, the locals became more brazen in hunting the specter down. A tax collector named Francis Smith took his loaded gun and went on aggressive, Zimmerman-esque patrols through the cemetery. One night he encountered Thomas Millwood, a 32-year-old plasterer, on his way to his parents home. As was customary for any plasterer, Millwood was dressed in all-white. When Smith saw Millwood, he shouted "Damn you. Who are you and what do you want? I'll shoot you if you don't speak." This was followed immediately by a gunshot, which struck Millwood's jaw with such force that it snapped his neck, instantly killing him.
Smith surrendered to the constables and was tried in court, where he was found guilty of murder, and sentenced to be hanged and dissected. But public opinion was not entirely against him and, after an appeal, his sentence was changed to probation, setting a famous precedent in English law.
As for the real Hammersmith ghost, he came forward shortly after Smith's arrest. Local shoemaker John Graham admitted that he'd been dressing up as the ghost to spook his apprentices, who had been scaring Graham's three children by telling them ghost stories. Graham was arrested and let out on bail. After that, there is no record of any punishment coming to him, so apparently it's pure anarchy when fake ghosts are involved.