In a recent CNBC interview Marc Fabor, or Dr Doom as he's often called, pointed out that before the market crash in 2000 there was a tech bubble, and there was a bubble in finance and real estate sectors before the huge market fall in 2007, but now there's a bubble in everything and the stock market will eventually crash like you wouldn't believe.
Ok, many investors know that already. But the one thing nobody knows is when the market is going to sink this time around. I don't know, you don't know, nor does Marc Fabor, Warren Buffet, George Soros or anyone else.
Just remember bull markets always last longer than you'd expect and bear markets fall deeper than you'd ever imagine.