A new crop of novelty brunches warrants a weekend wake-up call. In Boston, the Langham Hotel’s Cafe Fleuri goes decadent every Saturday with its family-friendly chocolate brunch, a 25-plus dessert buffet of chocolate sushi, s’more sandwiches, chocolate pizza, and even low-carb sweets ($26, 617-956-8751, www.langhamhotels.com). In New York, the innovative Snack Taverna serves up eggs Grecian style and a load of small Mediterranean plates for prenoon noshing ($6-$12, 212-929-3499). And Levende in San Francisco rocks the breakfast hour with its Sunday “boogie brunch,” featuring deejay-spun tunes, a Build Your Own Bloody Mary bar, and truffled scrambled eggs ($16, 415-864-5585). Dare you to yawn.