Opening Trap?

I renewed my expired Internet Chess Club subscription and played a few games today. In one game, I defeated a Grandmaster and former camp coach of mine by using an opening trap to win a pawn, a significant edge in the ensuing blitz craziness. On further reflection however, this "trap" doesn't necessarily lead to an advantage for white against proper defense. It seems that my sacrifice was a bluff and my esteemed opponent would have been OK if had just taken my bishop.

Before clicking through the game, see if you can calculate some of the key lines in the position below.