Most people who claim to see the future are easy to dismiss. Vague enough to mean anything, specific enough to sound impressive after the fact, and almost always wrong about the big stuff. But once in a generation someone comes along whose track record is just uncomfortable enough to make you pause.
Baba Vanga was a blind Bulgarian prophetess who spent decades consulting with everyone from ordinary villagers to Soviet leaders, and who left behind a collection of predictions that, depending on how generously you interpret them, range from eerily accurate to genuinely inexplicable. She left Earth in 1996. She predicted that too.