Sesame Street characters do impressions of other Sesame Street characters…
Actually, I believe it's Matt Vogel doing an impression of Jerry Nelson as The Count doing impressions of other Sesame Street characters, and David Rudman doing an impression of Frank Oz as the Cookie Monster doing impressions of other Sesame Street characters, and Ryan Dillon doing an impression of Kevin Clash as Elmo doing impressions of other Sesame Street characters, and Leslie Carrara-Rudolph as Abby Cadabby doing impressions of other Sesame Street characters. But you get the idea…