The moment where everything changed in the life of Sirius Black.

As he slowly took a seat in the stool in front of him he pondered his remaining options: Slytherin and Gryffindor; remaining apart of his family or turning into a traitor; a mudblood hater or a muggle lover; evil or brave; hated by Hogwarts or hated by his family; a Death Eater or an anti-Voledmort fighter.  He couldn't believe a boy his age should have to make a decision like this, that would determine the rest of his life.