The authors report on a case of catatonia in a 16-year old male admitted to the hospital 24 hours after ingesting an unspecified dose of ecstasy. Catatonia included motoric immobility, bladder paralysis, mutism, "negativism" and refusal to eat. The patient had no previous history of mental illness, aside from an "inhibited" temperament, and results of all biological examinations were normal (body temperature is not reported,) Presence of MDMA in blood or urine was never established. The patient did not improve after benzodiazepines or haloperidol, but administration of clozapine produced marked and continued improvement over a 2 to 3 week period. Recovery of bladder function and either ability or desire to eat and drink appeared first, to be followed by recovery of speech. The patient was delusional and confused on recovery of speech, with both perxecutory and megalomaniacal delusions, and sensory amplification. The patient was discharged after 23 days, and follow-up visits at 6 weeks and 4 months confirmed full recovery. Other cases of catatonia acutely after ecstasy were associated with hyponatremia. Catatonia in the general population of children and adolescents is seen in as part of schizophrenia or bipolar disorder.