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Xenoglossy or xenoglossia is the phenomenon where one can speak or write a foreign language allegedly without having it learned in a normal way. The term is used to describe a type of miracle in Christianity  and those "girl hits her head, starts speaking Sanskrit" stories. A few xenoglossia claims have been investigated and it always turns out that the claim has been overblown: either the speakers had had previous exposure to the "new" language and/or their command of it was very poor, or they were just making it up, as in the video below.
- Glossolalia, a.k.a. "speaking in tongues"
- Acts 2:1-13