Steve Martin's letter to little Judd Apatow

This has scampered across the Twitterverse, thanks to Judd Apatow's posting of it.
It's the way Steve Martin responded to fan mail (some fan mail) back during his Wild and Crazy Guy days. Very cute. Personal enough -- despite the form letter trappings.
Remember, this was the era when he'd drag a comedy club audience all the way to Mcdonald's and order one French Fry.