Interestingly, while learning Arabic (right to left language), a lot of us could then read/write English right to left without ever practicing it. One day a student started writing something in English on the board from right to left (by accident) and was several words in before anyone noticed.

yes, i started to make notes in german in hebrew script (with yiddish transliteration rules), because it is much easier as a left-handed person. in university i was doing some mirror writing, until a professor teased me.