James tried learning Morse Code, tried and failed.
James, however, didn't think that he failed, so he tried teaching Sirius.
I suppose this worked to some extent because they seemed to know what the random tapping meant even if no one else did.
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Marauders Headcanons Stuff 'n' Things
FanfictionMusings and short stories written about some boys who go to a school for wizards. But definitely not the one that transphobe wrote about. We don't FWT. Part 2 of this book can be found on my page, believe it or not. (These headcanons were written...