It goes deeper than just Harry Shearer and Michael McKean. If you look across all 10 seasons of "Friends," you'll see most of the regulars from that series of mockumentaries (comedy favorites such as 2003's "A Mighty Wind" and 2000's "Best in Show"): Shearer, McKean, Jane Lynch, Bob Balaban, Fred Willard and Jennifer Coolidge.

That seems like too much to be a coincidence, until you look at the rest of the "Friends" guest list. That show devoured guest stars, and its success meant it had the funds to shell out for big ones.

Along with the impressive list above, "Friends" also benefited from pop-ins by Julia Roberts, Brad Pitt, Susan Sarandon, Danny DeVito, Hugh Laurie, Ben Stiller, Reese Witherspoon and way, way more.

Could there be a better list of guest stars? (Yes, that is a "Friends" reference.)

All of this is to say that it seems the only connection that led to McKean and Shearer appearing on "Friends" is the show's connection to an unbelievably full Rolodex (remember, this was the '90s).

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