if you want to buy right now, but there's no one around willing to sell it to you, you keep raising the price until you find someone who is. If you use a market order (no price limit) in a low liquidity environment, that could be $22 instead of $1.71 (the current stable price). if a trader does this by mistake with a huge size order, it's called a fat-finger trade:

Overnight, a Japanese brokerage firm was forced to cancel a trading error worth $711 billion, an order with a value bigger than the Swedish economy.

Predicting financial markets is notoriously tricky, but disrupting them can be simple, all takes to send the market into meltdown in these cases is one “fat finger” pressing the wrong button.

Link: History’s biggest ‘fat-finger’ trading errors