My all time favorite Dear Prudence came one night in August, 1979.  Jerry Garcia, Merle Saunders and Martin Fierro were playing with a band called Resurrection at the Temple Beautiful (which, I am told, was at the site of the old Fillmore West).

There was a large open floor onto which someone had dragged a single chair.  It was about 2:00am when the song began, and I somehow found myself sitting in that chair, eyes closed, grooving to the tune.  The jam openned up into some absolute wildness, and when I finally stood up to watch, what I saw was the band, standing in slack-jawed amazement, watching Garcia wail.  

I saw Jerry play Dear Prudence many times after that, with both the Dead and the JGB, but nothing has ever quite matched that performance.