Bitcoin dropped 8.5% and hit $43K because of a one word tweet by Elon Musk.
Somebody on Twitter speculated that Tesla would now sell the Bitcoin they're holding after announcing last week that Tesla would no longer accept the cryptocurrency as payment, Musk replied with one word: "Indeed". That was enough to get cryptocurrency investors to start selling Bitcoin which caused one of Bitcoin's biggest drops in value since the price first began to rapidly increase in January.
Link