The gospels have accounts of events surrounding Jesus' birth, and the subsequent flight into Egypt to escape the wrath of Herod (Gospel of Matthew 2:13-23). There is a general reference to the settlement of Joseph and Mary, along with the young Jesus, at Nazareth (Matthew 2:23; Gospel of Luke 2:39-40). There is also an isolated account of Joseph, Mary, and Jesus' visit to the city of Jerusalem to celebrate the Passover, when Jesus was twelve years old (Luke 2:41-50).

Following that episode, there is a blank space in the record that covers eighteen years in the life of Christ (from age 12 to 30). Other than the generic allusion that Jesus advanced in wisdom, stature, and in favor with God and man (Luke 2:52), the Bible gives nothing more about Jesus' life during this time span. A common assumption amongst Christians is that Jesus simply lived in Nazareth during that period, but there are various accounts that present other scenarios, including travels to India.

http://en.wikipedia.org/wiki/Lost_years_of_Jesus

So what's all this about then?

Watch: http://www.youtube.com/watch?v=yiy5uY3Iw2s&feature=related