S6E5: Sideshow Bob Roberts
Dad, I'll spare you the embarrassment of admitting you don't know who Sideshow Bob is.
Sideshow Bob used to be Krusty the Clown's sidekick.
But in 1990, he framed Krusty for armed robbery, and Bart got him put in jail.
- When he got out, he married Aunt Selma...
and tried to murder her. Oh, Side show Bob!