A 21-year old man was brought to the emergency department (ED) with complaints of acute, progressive generalized weakness and deteriorating mental status. The patient was well until 4 h prior to hospital admission, when he noted difficulty in climbing stairs due to weakness in his thighs. The weakness then progressed to involve the upper extremities and finally his face, affecting his speech. Approximately 4 to 6 h before the onset of his symptoms, he had played soccer and then had a large meal that included canned food imported from Mexico. His companions spoke only Spanish and were not aware of any medical history. They knew of no similar events or any other associated symptoms.