Further Proof that my Brain is eating itself

Me: What time do you want to go to Target?
My Roommate: It doesn't matter. I just need to get deodorant and I probably should get the Czech girl something for Christmas
Me: The Czech girl? What about the girl from Prague?
My Roommate: [Blankly stares at me] Prague is in the Czech Republic.
Me: [A Very Long Pause as I realize how stupid I am] Let's not mention this to any of our friends.