On Halloween 2024, the stock market experienced a notable sell-off, marking a departure from historical trends where the S&P 500 typically avoids significant declines on this holiday. Over the past 30 years, when the index was up for the year, the worst decline recorded on Halloween was just 0.38%. However, this year, market analysts noted a 'really tough day' for stocks, particularly in the technology sector, which contributed to the overall market downturn. The S&P 500 index was closely monitored, with specific attention on the level of 5,735 as traders assessed intraday options flows amid the sell-off. Reports indicate that fear has returned to the stock market, suggesting potential for further volatility in the coming days.