Not during service, but at class, with one of Polish Orthodox archbishops. While answering him, I told "ojcze" ("father") instead of "władyko" (master, for hierarch). So I told sorry and during talk with him at break I said again exatly the same, "father". But thanks God, he knows me, so he just said "no problem". I can't imagine face of our metropolitan if I did something like this.