No problem, I'm glad to have such a great discussion! By the way, English teachers in slavic countries like to teach very old phrases/memes. Like "raining cats and dogs" for the heavy rain, "wet blanket" for a grinch person. Also they can trying to tell something about cockney (which will never help students in real life) So it's no wonder that some virtually non-existent russian memes could go into textbooks. But the "go to Riga" is not completely dead yet. Need to wait for a decade or two :)