NCIS - "A Man Walks Into A Bar..."

What starts as a normal episode of NCIS where the team investigates the death of a Navy XO turns into one of the best episodes when they have to do it while being assessed for psychiatric evaluation.
The cool thing with this episode is that each person keeps coming back to how they feel about the loss of Agent Kate Todd from almost six years ago.  This seemed very strange that they were all considering her so long after her death but the link is revealed near the end, which I won't ruin for anyone who hasn't seen thsi excellent episode yet.
It was really good to see Kate back in the show, even if it was a series of flashbacks.  I always thought I didn't want to collect this series on DVD but this has made me very nostalgic.  Don't be surprised if in a couple of years time I do a review of season one!
There was even a good twist on the real reason for the XO's death after a number of red herrings.  Very clever writing yet again.
And in reference to the episode title, it is the beginning of a joke that the psyc evaluator tells Gibbs: "A man walks into a bar and asks the bar tender for a glass of water.  The bar tender pulls out a shotgun and shoots the man narrowly missing him.  The man says 'Thank you' and leaves a tip ont eh bar and walks out"  Gibbs answers, "He has the hiccups".  This is in reference to the bar tender recognising the hiccups and scareing them out of the man rather than using a glass of water.  So does this mean to see someone who appears to be a threat initially as more of a help?  What does this mean for future stories?
A great episode and highly recommended.