Norman Osborne (Willem Dafoe), the Green Goblin, is mortally wounded by his own device while attempting to double-cross Peter Parker (Tobey Maguire), a.k.a Spider-Man. Before dying, Norman asks Spider-Man not to tell his son Harry (James Franco) that he was the Green Goblin. At Norman's funeral, Harry tells Peter that he vows to avenge his father's death at the hands of Spider-Man (can you say "sequel-fodder?")
Thanks, Silvermarc!