Umm, I'm no genius but I was managing my mother's money at the time of the 2008 crash. It was very obvious to me that there was going to be a crash, I pulled out of the market in late 2006 and didn't lose a dime in the crash.
I think the better statement is "The 2008 crash was obvious but many people were in denial".
Again, I'm not a financial wizard, I could just see the writing on the wall on that one, everyone was getting approved for houses they couldn't afford, you just knew that was not going to end well.