That’s easy, you have your brokerage put a stop on it. When it reaches a certain point, it gives a sell order and you’re out. I’d say most people aren’t in it for the money, they just like watching the shorts getting hoisted by their own petard. If they break even they’re happy and have something to tell their grandkids.
You do know a stop doesn't guarantee a trade
. A trailing market stop could see you at at the absolute bottom.
A trailing limit could leave you holding the stock after the storm.