He claimed that he had arrived from 2036. He told what the planet was waiting for, and then abruptly disappeared

He came from 2036, he was an American soldier and he knew what would happen in the planet in the years to come. At least, that's how John Titor, 1 of the most celebrated alleged time travelers, presented himself. His past was so detailed that he inactive has his supporters today. Only that the future made him an highly malicious number. It did not turn out as he had promised.