Everyone knows about KFC's Crazy Thursday.

But you might not know that the financial markets also have their own "Curse Calendar."

Let's start with a strange pattern—

Since 2017, the S&P 500 has been the only trading day on average to close lower on Thursday.
Bitcoin? It’s the same—often underperforming on Thursday as well.

But gold and the Japanese Yen tend to rise most steadily on this day.
This kind of divergence is definitely not a coincidence.

The US bond market is even more extreme:
Monday is often hammered down, while Wednesday can surprisingly rebound.

What's really going on behind the scenes?

After digging through some data, I found a few key clues—

**Monday’s US Treasury Sell-off**
Many major news events ferment over the weekend: policy statements, geopolitical conflicts, central bank remarks… The bond market's big funds are the most sensitive to risk, and their first reaction at Monday’s opening is to reduce positions and seek safety.

**Wednesday’s Liquidity Magic**
The Federal Reserve’s overnight reverse repo settlement cycle is usually completed before Wednesday. This day tends to be the most liquidity-rich of the week. More money means bonds are easier to sell.

**Thursday’s Data Dump Day**
Initial jobless claims, PPI, CPI… Critical macroeconomic data are released in clusters.
Even more importantly, a large number of weekly options and structured products are repriced on this day. When volatility kicks in, risk assets suffer first.

This time preference is not accidental.
Retail investor habits + quantitative models + institutional rebalancing—these forces repeatedly reinforce each other, ultimately solidifying into the market’s “collective memory.”

But Bitcoin’s situation is a little different.

What it dislikes most right now is actually the **weekend**—especially Saturday.

Why?
Institutional market closure, liquidity drying up, retail sentiment dominating… These factors combine, making BTC’s weekend look like an unattended playground—volatility can spiral out of control at any moment.

So next time you’re watching the markets, consider paying attention to the calendar.
Sometimes, the market’s temperament is more predictable than you think.