[Tries to hide the look on his face that this is a flat-out lie]
Seriously, though, my partner handles my obsessions in the best way. She lets me go off & ramble about them, and when I've reached a kind of pause, she cuts in with:
"Ryan, your autism is showing," in an endearing tone of voice that's short for "I love that you do this, I want you to keep doing it, but I have no idea what you're talking about." lol