Manganese poisoning
Wilson disease
Some types of epilepsy
Alzheimer’s disease
Pick disease
Rett disorder
Angleman disorder
Williams disorder
Some types of schizophrenia
Lou Gehrig’s disease
February 8, 2001
Disorders in Which Laughter May Be a Symptom
As little as $1 a month ($12 a year!) goes a long way toward supporting our editorial staff and contributors while keeping us ad-free. Become a McSweeney’s Internet Tendency patron today.