Wolf Knife!
The perfect gift for a 15-year old is, of course, a knife. But not just any knife, though - the kind of knife that gives the wielder the power of three wolves. Then the 15-year-old will pass it on, completing the Circle Of Wolves, a tradition dating back millenia. Or, he'll just make a joke of it that'll last the better part of a decade. Either way, it's full of win.