Psychology
In 1913, a Monte Carlo roulette wheel landed on black 26 times running
Gamblers watched black come up again and again and grew certain red was 'due,' piling money onto red as the streak grew. Every spin was independent of the last, so the odds of red never actually shifted — the casino won a fortune off bettors chasing a pattern that wasn't there. Psychologists call this the gambler's fallacy.