" Exit Through the Kwik @-@ E @-@ Mart " is the fifteenth episode of the twenty @-@ third season of the American animated television sitcom The Simpsons . It originally aired on the Fox network in the United States on March 4 , 2012 . In the episode , Bart is punished by Homer after causing trouble . He gets revenge on his father by spray @-@ painting images of him with the word " dope " all over Springfield . Street artist Shepard Fairey encounters Bart one night and offers him a gallery show of Bart 's artworks . However , Chief Wiggum suddenly appears during the show and arrests Bart for covering the town in graffiti . It turns out that Fairey is an undercover officer working for Wiggum .