I can speak and write a small amount of Finnish, enough to confuse Finns with my bad grammer and spellings or Finn-lish.
I can speak understand a more of spoken German/Swiss-German, but since living in Finland (before I returned to the UK,) it has replaced some the German I learned from many years of skiiing holidays.
Even now, I am now more likely to think of the Finnish words 1st, than in German (as I used to before I went to Finland,) when my brain attempts to translate what little I still know.
TPBM probably has more knowledge of getting languages mixed up between their brain and their mouth than I.