Played by: Julianne Moore
Watch for yourself

She may have scored an Oscar nod for playing fictional porn star Amber Waves in P.T. Anderson's Boogie Nights, but Julianne Moore's turn as Nancy Donovan—the long lost teenage love of TGS boss Jack Donaghy (Alec Baldwin)—on 30 Rock proved that the highly lauded actress can't do everything. And by "everything" we mean a proper Boston accent. It actually hurts the ears to listen to this cacophony of mangled pronunciations.