30 Rock (2006)

"SeinfeldVision," Season 2, Episode 1 Jack's big plan for the new season is to digitally insert Jerry Seinfeld into every NBC show, and a furious Seinfeld turns up at 30 Rock to object in person. It is the show mocking its own network's desperation with a real star playing along, and the premise alone generates a stream of jokes about TV executives. Critics were lukewarm at the time, but as a season opener it moves fast and never wastes its guest star.