Essentially, "bird law" is a total non-sequitur played off for laughs to show how out-of-depth Charlie is in the real world. It’s a nice wink to "Always Sunny" fans watching the crossover.

The It's Always Sunny in Philadelphia half of the Abbott Elementary crossover is set to premiere in June, Rob McElhenney ...

The star of the FX series also admits he was initially hesitant about the crossover concept as 'It's Always Sunny in Philadelphia ... with something funny to do. Charlie Kelly fit so naturally ...

The Gang' cleaned up its act when it appeared on the ABC sitcom. But Rob McElhenney says the 'Abbott' teachers will curse and ...

When “Abbott Elementary” creator Quinta Brunson mentioned the idea of a crossover episode with “It’s Always Sunny in Philadelphia” — fueled from a conversation with Rob McElhenney ...

It’s always busy for the It’s Always Sunny in Philadelphia cast.

At first glance, a crossover episode between Abbott Elementary and It’s Always Sunny in Philadelphia makes all the sense in the world. Both comedies are beloved by their respective fans, set in ...

But for those of us who are so deep on the Always Sunny ... law and having endangered bird eggs planted on the planned grounds for a golf course next door. Once again, aviary attorney Charlie ...

"It was a real privilege for me to get to be a part of it, to have them bring us in and make us a part of what they do, which they do so well," says the It's Always Sunny star and executive ...