The actors discuss playing best friends and roommates on FX's long-running comedy, which kicks off its 17th season Wednesday, and why "whenever Charlie does something, it titillates Frank."

The incident involved a stunt for a Season 11 episode, in which the show’s characters were trapped in a room with a water leak.

Plus, Charlie Day and Glenn Howerton tell TheWrap which other sitcom they'd love to cross over with after "Abbott Elementary."

In Wednesday's Season 17 premiere episode of "It's Always Sunny in Philadelphia," the "Abbott Elementary" cast gets to cuss — including the "c-word"!

Author Kimberly Potts’ new book out July 1, “It’s (Almost) Always Sunny in Philadelphia: How Three Friends Spent $200 to Create the Longest-Running Live-Action Sitcom in History and Help Build a Network,” details the show’s unlikely rise to prominence and behind the scenes stories.

The It's Always Sunny in Philadelphia cast has thoughts on the worst things the gang has ever done, though some of their answers are a little out of left field.

It's Always Sunny In Philadelphia stars Charlie Day and Danny DeVito discuss when the long-running sitcom will come to an end as season 17 begins.

FX’s It’s Always Sunny in Philadelphia is set to return on July 9, and fans are not only excited to see the new season, but to watch the crossover episodes.

Danny DeVito and Rhea Perlman's eldest daughter, Lucy DeVito, got married on June 28, the 'It’s Always Sunny in Philadelphia' star revealed to PEOPLE. 'It was amazing, wonderful,' he said of the wedding.

“They were like, ‘We don’t want to end it,'” Howerton recalled his co-stars saying. “And I was like, ‘Oh, well I can’t stop you.’ And then Seasons 13 and 14, I came back as an actor but I wasn’t in the writers room.”

"Beyond season 18, I don't know... it could quite possibly be the end," says the star and executive producer to THR about the longest-running live-action sitcom, now back with season 17.