Oh my god, I'll bet they're both secret language geeks as well. Rodney because-- Canadian, hello, he learned French, and of course he learned German, he needed to speak the language of his intellectual peers, didn't he? He learned Latin on the side, a language made for learning, pure and almost mathematical in its regularity. And John's picked up the local language of every country he's been posted, and a few others besides, though his vocabulary's always been a bit, uh, specific.

Oh god, why is my personal canon so ridiculous? WHY?