BYOB (bring your own booze) may be one of the sweetest acronyms around. Especially in NYC where restaurants' legendary nosh is matched with more than legendary prices. That spaghetti carbonara with the 2010 bottle of Montepulciano? Yeah, it doesn't come cheap. So when those four little letters are printed or uttered in order, us New Yorkers do backflips — and then immediately rush to the nearest spirits store.