Retail investors piled into Twitter Inc. stock on Thursday, after the world’s richest person and head of Tesla Inc. roiled the financial world with an audacious bid to purchase the company for $43 billion. Musk later expressed doubt about whether the blockbuster deal will succeed, but that didn’t do much to deter non-professional traders.

When was the last time your entire paycheck shrank by more than 20%? If you are being paid in Bitcoin, the answer was Saturday, when the token fell as much as 21% in a matter of hours.