[Bart sighs at photo of Skinner]
Lisa: Wow, I never thought Principal Skinner could become any more of a
square, but there's the proof.
Bart: It's weird, Lis: I miss him as a friend, but I miss him even more
as an enemy.
Lisa: I think you need Skinner, Bart. Everybody needs a nemesis.
Sherlock Holmes had his Dr. Moriarty, Mountain Dew has its Mellow
Yellow, even Maggie has that baby with the one eyebrow.
[Maggie scowls out the window as said baby goes by in a baby
-- "Sweet Seymour Skinner's Baadasssss Song"