Could the finale of 30 Rock perhaps be the best finale of all time? Too early to tell?
Legitimately funny, in keeping with the run of the show, poignant, referential, creative, innovative, comprehensive.
I've seen finales that do things epically or emotionally, but I can't recall one that did so many things so well without missing a beat.
"Matthew McConaughey is a pilgrim in search of a shirt. He does not realize the shirt was inside him the whole time."