2. Jesse's Murder Of Gale
It's the turning point of the entire show for both Jesse and Walt. Jesse makes a choice he cannot live with. A choice which makes him take personal responsibility for his actions. A choice which causes him and Walter to slowly fall apart and the ultimate collapse of his empire in season 5. For Walter, he puts himself against Gus in a fight that eventually sees him take his place as the king pin of the operation. This is where he chooses to become the one who knocks and fight, rather than flee. In doing so, Walt chooses his ego over his original intentions: family and funds. Yes, he prevents his own murder but in asking Jesse to take this step, he turns a corner that cannot be unturned http://www.youtube.com/watch?v=EHX7cDJ3Prk