A lot of people believe that NCIS was great from the beginning, but I really feel like it took a few years to get its footing (and to get Sasha Alexander out of there in favor of Cote de Pablo.) This episode though was really good. It was funny, but more importantly it was highly entertaining from start to finish and featured a brilliant twist resulting in a humorous situation for one Tony DiNozzo.
And Gibbs pulling the trigger at the end? That was just, well, awesome and really further established the credibility of the character when it needed it.