As a data scientist with 5 years of experience analyzing Premier League tactics, I’ve seen my fair share of upsets. But this one? Paris Saint-Germain — the golden generation, the unstoppable machine — collapsing against a team from Brazil’s second division? That’s not just a shock. It’s statistically improbable. In this deep dive, I break down why this result defied every model, every expectation, and why it might be the most surreal moment in modern football history. Spoiler: even my algorithms were confused.