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"Ludachristmas," 30 Rock
Worlds collide when Jack's brusque mom, Colleen ("Some terrorist cells are more nurturing than you," Jack tells her), and Liz's aw-shucks, "perfect" clan — mom Margaret, dad Dick and brother Mitch, who has "Trauma-Induced Nivea Fascia" — drop by to visit. Jack says there's no such thing as a perfect family, and Colleen makes it her mission to prove the Donaghys right, eventually turning the drunken Lemons all against each other at dinner. And with that, Jack wishes his mom a merry Christmas.