Fans of "It's Always Sunny in Philadelphia" and "The Office" are getting excited about a potential crossover episode of the 2 popular TV shows.

According to IndieWire, the rumors started when the creator and star of "Always Sunny," Rob McElhenney, posted this video, directed at "The Office" star Steve Carell, on Instagram.

View this post on Instagram

The bar inside Dunder Mifflin is now called Paddy’s.

A post shared by RobMcElhenney (@robmcelhenney) on

Carell responded with this tweet...  

"It's Always Sunny" is set in Philadelphia and "The Office" is set in nearby Scranton, PA, so it is very possible that employees of Dunder Mifflin might show up for a drink at Paddy's.

In addition, IndieWire says that "It's Always Sunny" paid homage to another classic sitcom in Season 13.  Check out this clip from the show's Seinfeld parody...

"It's Always Sunny in Philadelphia" will kick off it's 14th season on FXX on September 25.

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