Since she was an infant, a 31-year-old woman had been experiencing bursts of uncontrollable laughter, but her condition had never been formally diagnosed until now. According to the woman, she would ...

The symptoms: The woman visited a clinic because she had long experienced bursts of uncontrollable laughter, which doctors described as "mirthless" in a report of her case. According to the patient, ...

I don't think I've ever laughed harder than during a church service, when something faintly ridiculous caught my eye. My friend saw it too, and once she started laughing, it became impossible to stop.