appeared on Fuse's original comedy series The P.A.. She appeared in two TV pilots written and directed by Jersey City comedian Dan McNamara – The Calderons and Redeeming Rainbow, both of which were screened as official selections at the 2006 and 2007 New York Television Festivals. She appeared in television commercials for T-Mobile, Wendy's, RadioShack, Starburst, Sony Xperia, and Zaxby's. She made an appearance, in April 2008, on the IFC sketch comedy show The Whitest Kids U' Know. On April 3, 2009, she taped an episode of Comedy Central Presents. In 2010, she added her voice to the PBS Kids GO! series WordGirl as Victoria Best, a child prodigy whose parents taught her to be the best at everything that she does. Schaal voiced 12-year-old Mabel Pines on Disney Channel's hit TV series Gravity Falls. She currently voices the character Louise on the FOX Network series Bob's Burgers. She starred in A. D. Miles' MyDamnChannel.com series Horrible People. In October 2008, Schaal appeared in an episode of Spicks and Specks. On June 10, 2009, Schaal broadcast her first radio show, High Five!!, on Sirius XM Radio's 'RawDog' channel with co-host Kurt Braunohler. Schaal stars in her own web series, Penelope Princess of Pets, one episode of which doubled as the video for the New Pornographers' "Mutiny, I Promise You". She voiced Trixie the Triceratops in Toy Story 3 and Pumpkin Witch and Palace Witch in Shrek Forever After. She was also in the music video for Joey Ramone's "New York City." She also guest-starred in the Modern Family episode "Fifteen Percent", as well as the music video for "Conversation 16" by The National. Schaal guest starred on the MC Frontalot album Solved. She was featured with Kurt Braunohler on the Radiolab episode "Loops". Schaal was in a commercial for the Xperia Play version of Minecraft. Schaal guest starred on The Simpsons May 8, 2011 episode "Homer Scissorhands," in which she plays Taffy, a love interest of Milhouse. She is incorrectly listed in the credits as "Kristen Schall". This prompted Simpsons writers to issue her a unique apology on the next week's episode in which Bart's chalkboard joke in the intro to the show states "It's Kristen Schaal, not Kristen Schall." Schaal also appeared in a music video for "Weird Al" Yankovic's 2014 song "Tacky", a parody of Pharrell Williams' "Happy". In 2013, Schaal guest starred in the two-part episode "Sea