The Oatmeal's response, both the informal and the 'legal' version, were the most interesting law-related documents I have read. There is something inherently amusing about a serious legal document describing a comic about pterodactyls tearing you a new asshole.
And yes, 'The Oatmeal' is exceedingly canny- he does what he does very well, and his success in raising way more than $20k shows how very smart he is. His response to this could not have been better played. What he did means that funnyjunk and their lawyer are going to look terrible, whatever they do from now onwards in response to what he did.