In books and movies, you know to watch out whenever everything is going great for the main character. There's always some disruption that throws things off balance.

Investors could be in a similar situation right now. The S&P 500 soared 24% last year. The index has risen in the high single digits so far this year. Everything seems to be going great.

However, you won't have to look hard to find potential disruptions to this sunshine-and-roses market. One S&P 500 valuation metric is at the third-highest level ever. Could stocks be poised to plunge?

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Source Fool.com