I had to check the calendar to make sure it wasn't April 1st when I read this. Sarah Colwill apparently got a brutal migraine, called an ambulance, and started speaking with a Chinese accent. According to the London Daily Mail:
Doctors say she has Foreign Accent Syndrome, a condition which damages the part of the brain that controls speech and word formation.
It is so rare, there are only 60 recorded cases in the world.
Mrs Colwill, 35, is baffled by the effects and fears she may never regain her normal pronunciation and tone of voice.
Always a skeptic, I looked for other cases of Foreign Accent Syndrome and found plenty — including this 2008 report from ABC News that includes video examples: "Foreign Accent Syndrome Gives Sufferers an International Sound."