TANGANYIKA LAUGHTER EPIDEMIC
If laughter is the best medicine, this proves it can also be the illness. On 30 January 1962, three girls at a boarding school in Kashasha, Tanganyika (now Tanzania), got the giggles during class. The teacher may have initially scolded them as troublemakers, but the laughter spread. Hysterical fits lasted between a few minutes and 16 days. The school eventually sent the girls home, taking the infection with them. In all, 14 schools had to close.