Why did Bitcoin price fall below $9,000 on May 21, 2020?

Attempt at quick explanation.

The date is May 22, 2020. This day is special in the history of Bitcoin as it is known as Bitcoin Pizza Day.

Indeed, on May 22, 2010, developer Laszlo Hanyecz made the first payment in Bitcoin history for a real world product. On the reference forum bitcointalk.org, he then posted a message saying that he was willing to pay 10,000 BTC for two pizzas:

Need…