A 57-year-old woman was driving with her daughter beside her when they both started laughing hard. Mid-laugh, she lost consciousness. Her daughter grabbed the wheel and steered the car off the road, avoiding a major collision. The woman came round shortly afterward with a fractured left wrist and no memory of the seconds that had passed.
It was not the first time. She had blacked out during a laughing fit at home once before, and nobody had worked out why.
