Just looked back at some old market data from early 2025 and remembered how crazy things got. The fear and greed index absolutely tanked back then—dropped to 3, which was the worst level since the COVID crash in 2020. People were genuinely panicked. What struck me was that it stayed in single digits for weeks, and every time that happened historically, you'd see brutal selloffs. The S&P 500 lost like 30% during that initial COVID period when fear was this extreme.

The whole thing was triggered by Trump's tariff situation escalating between the US and China. At one point China's tariffs on US goods hit 84% and ours on theirs went to 145%—absolute trade war vibes. Markets just couldn't handle the uncertainty, even with the 90-day reprieve that was announced. You could feel the anxiety in every trade.

What's interesting is how the index actually works. It looks at seven different signals—stock momentum, how many stocks are hitting new highs vs lows, options positioning, junk bond spreads, VIX, and safe-haven flows. When all of those point in the same fearful direction, you get these extreme readings. The fear and greed index basically tells you when everyone's thinking the same negative thoughts.

Historically, when fear hits these levels, it's either marked a buying opportunity or the start of something worse. The real signal to watch is when it climbs back above 25—that's when you usually see sustainable recovery. Anything below 10 is just noise and volatility.

There were a couple other instances around that time too. August 2024 had the Bank of Japan rate hike that unwound yen carry trades and sent everything down—Nikkei fell 12% in one day. Then December 2024 hit when the Fed signaled rates staying higher longer. Bitcoin dropped 15% that week alone.

The crypto fear and greed index actually hit 15 around the same period, so it wasn't just stocks feeling the pain. Looking back now, these extreme readings were real signals of market stress, though whether they marked bottoms or just speed bumps depended on what happened next with earnings and policy. Either way, when fear and greed index readings get that extreme, you know something's shifting in how people are positioning.