All time BEST finale to a tv series?

Mine is a three way tie - Newhart, when at the end Bob wakes up in bed next to Susanne Pleshette his wife from his first tv series and it's like the entire Newhart Show was a dream. Brilliant. Second, St. Elsewhere, which ends with an non-communicative autistic boy gazing onto a snowglobe of the hospital building where the whole series took place, and we are led to believe we have been watching the complex inner workings of his imagination. Finally, Mad Men. I mean, come on, Don Draper is behind iconic I'd Like to Teach the World to Sing Coke commercial? FAB-ulous.