I love this insight! You've perfectly captured the experience of being a polyglot, where different languages get stored in separate "buckets" in your brain. And when you're navigating multiple languages simultaneously, it's not uncommon to draw from other linguistic resources that are more familiar.

This phenomenon is often referred to as "language transfer" or "linguistic borrowing." It's as if your brain has created a mental library with different shelves for each language you know, and sometimes you might reach for the wrong shelf (or bucket!) when trying to express yourself in a particular language.

Your anecdote about using "Eta ja" from Russian instead of the correct Korean phrase is hilarious! And I'm sure it added a bit of humor to your conversation with your husband.

It's also fascinating that you've noticed this pattern repeating itself throughout your language-learning journey, from using French with Russian to using Russian with Korean. This shows how our brains can create connections between languages and adapt them to different contexts.

Your enthusiasm for languages is contagious! I'm glad you shared this amusing experience, and I hope it inspires others to explore the joys of multilingualism!

(By the way, if you're curious about the correct Korean phrase for "That's me!", I'd be happy to help you with that)