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"It's Always Sunny in Philadelphia" was renewed for a 15th season.Michael Buckner/Getty
Insider rounded up the longest-running comedies on TV, from "Will and Grace" to "South Park."
Surprisingly, animated shows took the top three spots.
"It's Always Sunny in Philadelphia" was just renewed for a 15th season, making it the longest-running live-action comedy series ever.
What makes a TV comedy successful is hard to pinpoint — comedy is a fickle thing. A show needs great writing, a hilarious cast, and a special x-factor in order to make people laugh. Sustaining all this over multiple seasons can be difficult.
These shows all defied the odds and stayed on air for at least 10 years. From "The Simpsons," renewed for its 31st and 32nd seasons, to "It's Always Sunny" which has been renewed for its 15th season, we've ranked TV comedies by how long they stuck around.