30 Rock (2006)

"Jack-Tor," Season 1, Episode 5 The first episode where the show clicks. Jack orders the writers to slip GE product plugs into TGS, 30 Rock itself piles on shameless Snapple plugs (a man in a Snapple costume included), and Jack ends up acting in a sketch, badly. It is a satire of the network that pays for the satire, and the jokes arrive in layers: the product placement, the sketch and Jack's wooden takes all land at once. Watch this before the later seasons to see how early the show found its voice.