Regardless of whether or not this actually happened, it would be great to attempt to device a 2013-appropriate version. io9 writes:
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Sir Arthur Conan Doyle was supposedly the orchestrator of a cruel joke. One night, bored and idly toying with wicked thoughts, he decided to send a note to five of his friends. The note would be delivered anonymously. It would have no signature, and would contain no information. It would only say, “We are discovered. Flee!”
At his next dinner party, his social circle was abuzz with the sudden, and total, disappearance of one of the people he sent the notes to. The person was never heard from again.
But the story didn’t start or end with him. Edgar Allan Poe also was said to have done such a thing. He might even be said to be the better author to pair with the story, since he had more of a devilish sense of humor.