The AI-driven momentum that had lifted equities to record levels just hit a wall. Investors are having second thoughts about whether this rally can actually hold. Caterpillar's stock got hammered—sliding from all-time highs into its worst five-day performance since April. The narrative's shifting. What looked unstoppable a few weeks back is now under the microscope. Traders are reassessing sustainability, asking harder questions about valuations and underlying fundamentals. It's the kind of pivot that matters for anyone tracking macro trends. When enthusiasm cools this fast across major equities, it ripples. Portfolio rotations happen. Risk appetite gets recalibrated. For those paying attention to how traditional markets behave, this is worth noting—especially given how correlated digital assets have become with broader market sentiment.