This is definitely off-topic (who was that said I was single-minded?) but for a fine example of bletcherousness, try the source to the pine mailer (here also known as pain, or Pain In Neck Email). Find the 70K source

that handles the main mail stuff, and try 'grep goto' - and watch three

four screenfulls scroll by. All in one function (the 70K file is almost all one function).