"The combined levels of bullish optimism, lack of concern about a possible market correction (don't worry the Fed has the markets back), and rising levels of leverage in markets provide the 'ingredients' for a more severe market correction. However, it is important to understand that these ingredients by themselves are inert. It is because they are inert that they are quickly dismissed under the guise that 'this time is different.' Like a thermite reaction, when these relatively inert ingredients are ignited by a catalyst, they will burn extremely hot. Unfortunately, there is no way to know exactly what that catalyst will be or when it will occur. The problem for individuals is that they are trapped by the combustion an unable to extract themselves in time."