I had to ignore the spoilers in your post to post about this. :-)
The penguin thing has been around a while. Last year Leah (I don't recall her username) wrote a story for Peg B about McKay and Sheppard being turned into Penguins. Then someone else wrote a mainstream SGA Penguin story about the two of them turning into penguins. (Both stories are really cute, the first one is archived at the Pegasus_B com, the second is no longer on line, but I have the text file, so email me if you want it).
From there people started writing silly SGA penguin stories, and associated penguins with John and Rodney. There are some really cute stories out there (one was a flashfic, but I can't recall which challenge, or the story). You could ask around. I'm sure someone else knows.
This probably isn't the whole story, but it's all I know. :-)
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The penguin thing has been around a while. Last year Leah (I don't recall her username) wrote a story for Peg B about McKay and Sheppard being turned into Penguins. Then someone else wrote a mainstream SGA Penguin story about the two of them turning into penguins. (Both stories are really cute, the first one is archived at the Pegasus_B com, the second is no longer on line, but I have the text file, so email me if you want it).
From there people started writing silly SGA penguin stories, and associated penguins with John and Rodney. There are some really cute stories out there (one was a flashfic, but I can't recall which challenge, or the story). You could ask around. I'm sure someone else knows.
This probably isn't the whole story, but it's all I know. :-)