That cartoon has been around quite a while and I still chuckle every time I see it. At my previous job, I had requirements training with Karl Weigers (who wrote the "Software Requirements" book from Microsoft Press). I'm not a fan of BDUF unless you've only got one chance to succeed, but it was invaluable as a guide for learning how to communicate requirements. So if you're writing stories and practicing agile, are you being clear and concise?