Mine was counting change out loud without translating — my brain just did it in the local language. Such a small thing, but I grinned like an idiot in the shop. It's the first sign the language is becoming yours, not borrowed.
It happened last week — I caught myself doing mental arithmetic in the local language without translating, and a few nights ago I apparently dreamed in it too. After months of feeling like I was getting nowhere, these little signs felt huge. When did your brain first flip like that, and did it feel as surreal to you?