A Porsche!? is he serious? haha. I mean, I can understand - all 15 year old boys want a car. It comes with the territory. But he wants a Porsche? wow lol.
For my 16th birthday, I want a candy apple red mustang convertable with tan leather interior. I've wanted that car for as long as I can remember. I'm not exactly holding my breath, though.
EDIT:
I just saw your update! WOW. I would never have the guts to do that if I were him.