We don't see many Big Ideas any more. Content may be king, but content is forgettable, millions of tiny ideas in a million different places. Can anything new be said about a product? Or an industry, like the advertising industry? Well, I'm not a creative -- more like a dreaded management consultant. Nevertheless, here's a cross-industry Big Idea, free for the asking: Ad agencies are just like cruise ships! Don't dismiss this out of hand. Read on!