For the linguists. From Science Blog:
A University of Central Florida speech expert has diagnosed an extremely rare disorder in a Sarasota woman that caused her to speak with a British accent after she suffered a stroke. The case of Foreign Accent Syndrome -- a disorder linked to stroke-related or other internal brain injuries that leaves affected people with a foreign-sounding accent -- is one of fewer than 20 reported worldwide since 1919, according to Jack Ryalls, professor of communicative disorders at UCF.