You know that phrase, "Ignorance is bliss"? There's a reason it's stuck around all these years. Because having the upper hand in intelligence might give you an advantage in some areas, like crossword puzzle solving and quantum physics-ing, but it also might just screw up your life forever.
For instance, if you're smart ...
http://www.cracked.com/article_19174_5-unexpected-downsides-high-intelligence.html