You can slum it with a slice and a drink for $5 at just about every pizza joint in town, but when you want to slum it in style, either location of the Walnut Room feels your vibe. Throw down a fiver at the original, up on Walnut, or the new store, at the heart of Broadway, and a fresh-faced server, usually of the hipster sort, will trot out an eight-inch, thin-crusted pizza topped with whatever single ingredient tickles your fancy, a cup of soup or a house salad scattered with mozzarella, and a soft drink. If you're not a proponent of pizza, not a problem: You can order a half a sandwich instead, including the "Fat Bastard," heaped with provolone, five meats and a few scant vegetables to soften the guilt (or impending coronary). The $5 lunch deal runs from 11 a.m. to 2 p.m. Monday through Friday.