Krusty: Bart! I need to use you in a sketch.
Bart: You want me to be on the show?
Krusty: It's just one line. Mel's supposed to say it, but he's dead.
Krusty: Or sick, I dunno. I forget. Anyway, all you gotta do is say,
"I am waiting for a bus." Then I hit you with pies for five
minutes. Got that?
Bart: "I am waiting for a bus."
Krusty: Makes _me_ laugh. Let's go!
-- Humor for the masses, "Bart Gets Famous"