My father ate some canned pinapple last night with my mom and he suddenly had violent charlie horse like cramping down his legs then followed by his whole body, difficulty speaking because his jaw locked up, and intense body chills. When he laid down he was straight and stiff. This lasted around 5 min. He is 60 years old, perfect blood preasure, healthy weight, and no medications. What could cause this sudden onset of such intense symtoms?