The War of Art (The Simpsons) Lisa's new pet guinea pig destroys the Simpsons' living room art, Marge falls in love with a beautiful painting at the Van Houtens' yard sale, which Homer purchases for $20. Marge removes the frame and finds that the painting bears the signature of Johan Oldenveldt, an artist of some renown. An art appraiser estimates that it could bring between $80,000 and $100,000 at auction. Marge wants to share the sale proceeds with the Van Houtens, but Homer disagrees, saying that the Simpsons should look after their own financial security first and keep the sale a secret from them. Milhouse eavesdrops
The Simpsons show. The celebration ended on January 10, 2010 (almost 20 years after "Bart the Genius" aired on January 14, 1990), with "The Simpsons 20th Anniversary Special – In 3-D! On Ice!", a documentary special by documentary filmmaker Morgan Spurlock that examines the "cultural phenomenon of "The Simpsons"". As of the twenty-first season (2009–2010), "The Simpsons" became the longest-running American scripted primetime television series, having surpassed "Gunsmoke". On April 29, 2018, "The Simpsons" also surpassed "Gunsmoke"s 635-episode count with the episode "Forgive and Regret." "The Simpsons" has won dozens of awards since it debuted as a series, including 31 Primetime Emmy