Lisa: Sideshow Bob Used To Be Krusty The Klown's Sidekick.

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Lisa: Sideshow Bob used to be Krusty the Klown's sidekick. In 1990 he
framed Krusty for armed robbery and Bart got him put in jail.
Homer: Uh huh.
Lisa: When he got out, he married Aunt Selma and tried to murder her.
Homer: Oh, Side_show_ Bob.
-- Placing the emphasis carefully,
"Sideshow Bob Roberts"