FIRST OFF... I am not saying this is what we are going through now.
The crash of 2008 did have clear indicators well before it crashed that let you know the market was on shaky ground. These simple yet clear rising support lines should have given investors the idea to tighten up stops and protect the gains.
SCROLL TO THE RIGHT ON THE CHART AND SEE HOW THINGS CAN GET OUT OF CONTROL!!!
REMEMBER... You don't have to sell your entire position