5. A Gibbs' Rules episode - NCIS
Some NCIS fans can name every one of Gibbs' Rules by heart—and this episode was for them. In a letter to his father, McGee reflected on what those rules actually mean, and if they were meant to be broken. As episodes of NCIS go, this one will be remembered fondly by fans for a very long time.
Watch NCIS Tuesdays at 8/7c on CBS.