Two occasions of mysterious illnesses among girls: culture bound syndromes? The first is a Radiolab podcast about an 1962 outbreak of contagious laughter in Tanzania and the second is a New York Times Magazine article about a group of girls from Le Roy, New York (near Rochester).
Contagious Laughter Radiolab Podcast
The Mystery of 18 Twitching Teenagers in Le Roy
Lydia Parker, foreground, at home with her sister. She got one of the bruises on her face when an uncontrollable tic caused her to hit herself with her cellphone.
(c) Gillian Laub/The New York Times