Yes. A friend of mine was an American missionary to Bulgaria. He had only recently arrived in the country and had not learned Bulgarian. He was with a team one night that was holding an evangelistic service among ethnic Turks (Bulgarian citizens who speak Bulgarian but are Muslims). So many Muslims came forward to receive Christ that every other member of the team was praying with a new convert. My friend, seeing no-one was at the microphone, went to it and began to preach in perfect Bulgarian.