This Little Wiggy
The Simpsons: Season 9, Episode 18
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Marge invites Ralph Wiggum over for a play-date with Bart. When Bart goes back to the Wiggum household and finds it filled with police equipment and files, he is in a troublemaker's paradise.
Show: The Simpsons
Air date: March 22, 1998
Written by: Dan Greaney
Season number: 9
Episode number: 18
Director: Neil Affleck
Chalkboard gag: "I was not told to do this"