The Simpsons their advertising. As a promotion for "The Simpsons Movie", twelve 7-Eleven stores were transformed into Kwik-E-Marts and sold "The Simpsons" related products. These included "Buzz Cola", "Krusty-O" cereal, pink doughnuts with sprinkles, and "Squishees". In 2008 consumers around the world spent $750 million on merchandise related to "The Simpsons", with half of the amount originating from the United States. By 2009, 20th Century Fox had greatly increased merchandising efforts. On April 9, 2009, the United States Postal Service unveiled a series of five 44-cent stamps featuring Homer, Marge, Bart, Lisa and Maggie, to commemorate the show's twentieth anniversary. "The Simpsons"
The Simpsons Simpsons" has had crossovers with four other shows. In the episode "A Star Is Burns", Marge invites Jay Sherman, the main character of "The Critic", to be a judge for a film festival in Springfield. Matt Groening had his name removed from the episode since he had no involvement with "The Critic". "South Park" later paid homage to "The Simpsons" with the episode "Simpsons Already Did It". In "Simpsorama", the Planet Express crew from "Futurama" come to Springfield in the present to prevent the Simpsons from destroying the future. In the "Family Guy" episode "The Simpsons Guy", the Griffins visit