Some more from US TV Late Night:

This one has more to do with the the inflection, the sound, than with the actual phrase:

"I did not know that."
--Johnny Carson

"Herrrrrrrrrrrre's, Johnny!" [or any other name]
--Ed McMahon, introducing Johnny Carson


And another SNLism:

"It just goes to show ya...it's always somethin'!"
--Gilda Radner as Roseanna Roseannadanna