1 {scene: Platform 9 3/4}
1 Harry: Hi Ron, Hi Hermione. Well, here we are again for another year at Hogwarts.
2 Hermione: Hi Harry. Say, who's that incredibly handsome and dreamy new exchange student coming this way?
3 Shakespeare: Hi. My name's Will.
4 {scene change: Wills' desk at the office}
4 Shakespeare: This fan-fic is so going to rock.

It seems even Shakespeare succumbs to the temptation of Mary Sue.

Of course Mary Sue isn't restricted to Harry Potter.

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2013-04-17 Rerun commentary: I've removed the second link above, since it now seems to go to a dead page. Nowadays of course, I'd have linked to Wikipedia and TV Tropes instead.

That's the Hogwarts Express in the background, by the way. I got the LEGO set shortly before making this comic, and wanted to find a way to use it in the comic. That's set 4708, the first LEGO Hogwarts Express set. They've since released five (count them!) newer versions of the train.