According to @KobeissiLetter, the S&P 500 jumped about 100 points in 50 minutes with no new headlines, adding roughly $800 billion in market value, source: The Kobeissi Letter on X, Nov 21, 2025. The move was attributed to a rapid herd shift in the AI narrative—from calling AI a bubble to considering it the next big thing—creating mechanical, sentiment-driven swings, source: The Kobeissi Letter on X, Nov 21, 2025. The author expects these flips to repeat many times and advises using fear-based emotional selling to your advantage, signaling persistent intraday volatility for tactical traders, source: The Kobeissi Letter on X, Nov 21, 2025. For crypto, documented stock–crypto correlations during risk-on regimes mean sharp equity sentiment pivots can coincide with BTC and ETH upside, so traders should monitor spillovers during these AI-driven equity surges, source: IMF, Crypto Prices Move More in Sync with Stocks (2022); BIS, Crypto shocks and retail holding (2022).