I doubt any mortal, lest Jove have shone upon him with favor, has perfect pronunciation, diction, spelling, punctuation usage, and fluency. As a good example of irony (on alt.usage.english, they called it Skitt's Law), take a look at what hadapurpura wrote:
hadapurpura wrote:
Well, I am a hipercorrect [sic] person. I have perfect orthography, perfect pronunciation and speaking, do you have the same issue?
Although hadapurpura excuses himself from perfect English, the fact remains that he has made some mistakes: He misspelled hypercorrect as hipercorrect. He wrote a run-on sentence, breaking parallelism in the process: "I have perfect orthography, perfect pronunciation and speaking, do you have the same issue?" A good revision of that sentence would be, "I have perfect spelling, perfect pronunciation, and perfect fluency. Do you have the same issue?"
Overly formal, pedantic language is a diagnostic criterion for Asperger's syndrome, according to Gillberg and Gillberg's definition. Many of us probably share this feature, but I doubt any of us would claim complete perfection. By the way, hypercorrection usually means correction to the point of error. In the past, throne was spelled trone and pronounced likewise; someone eventually decided it would be more etymologically correct to spell it throne because it comes from Greek, even though the th in Greek would be pronounced like a normal t in English. People eventually started pronouncing the word as it was written. There are other hypercorrections that really are wrong in contemporary English, but I cannot think of any examples off the top of my head.