In my sermon at St James Church today, I explored the possibility that Jesus may have spent those "missing years" as a disciple of the Pharisees, and become a rabbi of that school. The notion is not original with me: see Harvey Falk's Jesus the Pharisee for a Jewish perspective. But in my sermon, it is the narrative in John's Gospel that I find intriguing. The full text of the sermon is available at Ekklesiastes, but here is the audio.
Tobias Stanislas Haller BSG