It's Always Sunny In Philadelphia May Have Spoiled Its Ending With One Line

It's Always Sunny In Philadelphia May Have Spoiled Its Ending With One Line FXX Contains spoilers for "It's Always Sunny in Philadelphia" Season 18, Episode 2, "Dennis and Dee Don't Get Rich" Now in its 18th season, "It's Always Sunny in Philadelphia" is by far the longest running live-action sitcom