Mary Sue: The Home Game
This was suggested over...well, it was one of the Mary Sue collecting communities, but I can't remember which one. Anyway, the game is simple: just go to fanfiction.net and search for your first name in "Story by Summary" under one of the really big story categories, like Lord of the Rings or Harry Potter.
I was a bit worried that I wouldn't have any Mary Sues under my name. There weren't any under LOTR, but I did pretty well in the Harry Potter world. I even got a story in German! Here are my results. Aeh, they're all so cute....
Why not try your luck?