What to do if you see someone down on the ground and shaking uncontrollably?

If you see someone on the ground shaking uncontrollably, first ensure your safety and assess the situation. Call emergency services immediately and provide them with clear details. If it's safe to do so, check for responsiveness and protect the person from injury by moving any nearby hazards away. Do not hold them down or put anything in their mouth; instead, stay with them until help arrives.