30 Rock = The Muppet Show rebooted Jun 09 2009
I've never seen 30 Rock (I KNOW, I KNOW) so I can't attest to the correctness of this, but supposedly the show is a rip-off of The Muppet Show.
EXHIBIT B: LIZ LEMON VS. KERMIT THE FROG
Both are the most normal characters on their respective shows. Both are unlucky at love. Both are neurotic worrywarts and type-a personalities who slow burn into a crazy breakdown once per episode. AND both have some kind of flirtation with the guest stars that ultimately goes nowhere. There is absolutely no difference between Liz Lemon and Kermit the Frog save for genitalia (Liz is a lady, Kermit has none).
Make up your mind, internet. Is Kermit Liz Lemon or Christian Bale?