In "Lazy Sunday," a music video that had its debut on the Dec. 17 broadcast of "SNL," two cast members, Chris Parnell and Andy Samberg, adopt the brash personas of head-bopping, hand-waving rappers. But as they make their way around Manhattan's West Village, they rhyme with conviction about subjects that are anything but hard-core: they boast about eating cupcakes from the Magnolia Bakery, searching for travel directions on MapQuest and achieving their ultimate goal of attending a matinee of the fantasy movie "The Chronicles of Narnia: The Lion, the Witch and the Wardrobe."