Polymarket was settling Paris temperature bets on a single Météo France sensor near the Charles de Gaulle runway perimeter. One guy figured out it was basically unguarded. He bought the long-shot temperature outcome for pennies. Then walked up to the sensor and hit it with a portable heat source long enough to spike the daily max reading. Market resolved in his favor. Temperature snapped back to normal within minutes. He did it twice, April 6 and April 15, pocketed $34,000 total, and was gone before Météo France caught on and filed charges. "Hyperstitions." Wild word for what is just a very elegant crime.