The market plunge on Thursday May 6th - was not due to a trader's 'fat finger' - it was due to massive sell orders with no bids. No bids = no value. This is why the value of the stock of a few companies dropped to less than a dollar.
Zerohedge.com posted actual audio from the pits of the S&P 500. You're listening to what a real stock market crash sounds like - it won't be the last.