It's a grand bluff, and the stars have a lot of fun with the charade,
especially during the scene where Rell and Clarence blatantly suppress their
panic - attack relief after surviving their first meeting with Cheddar.
So although
panic selling can disrupt the order book,
especially during periods of illiquidity, with the current structure «the stock market» being based off of three composite indexes, can never crash, because there will always exist a company that is not exposed to broad market fluctuations and will be performing better by fundamentals and share price.