I talk about only the ones that my friends share with me: writing, fantasy, steampunk, science fiction, the game Myst, dragons, anime/manga, etc
Which is why all of my true friends are nerds.
And which is why I am glad my uncle and everyone on his side of the family have some sort of autism spectrum disorder.
I make friends with people I can ONLY relate to and be myself around, which includes talking about my obsessions.
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We could sail on a pancake sail ship in an ocean of chocolate. And if it sinks we could hitch a ride on a ratatouille rocket.