Every season finale manages to be pretty impressive. It starts with Nancy starting her own growery, then finding out her new beau is in the DEA. Season two ends with a Mexican Standoff, season three with the burning of Agrestic, season four with Nancy revealing a pregnancy, season five with Shane's horrific Crowning Moment Of Awesome, season six with Nancy surrendering to the police in Shane's place, and season seven with an unknown assassin shooting Nancy.
And now season six's finale, forcing us to remember how much of a Bad AssMama Bear Nancy really is.
Nancy: I killed Pilar Zuazo. Arrest me.
Nancy's reaction to Shane's english teacher pushing him. In fact, Shane, Isabelle, and Ignacio's invasion of the teacher's house earlier was awesome as well.