And sticking with comedies, there are too many different approaches for a crossover to work. A show firmly set in the real world can’t cross over with the enhanced reality of 30 Rock without doing some damage to one series of the other. In the world of Louie, there’s no room for Always Sunny‘s Mac and Dennis to exist. And while the similar visual styles and world design of The Office and Parks and Recreation would seem like a good fit, they’re also grounded in a world where the local Pawnee governement has no reason to deal with a paper distributor in Scranton.