I have a question about syncopes, or "passing out." My friend found a way to pass out. First a person would crouch down, and breathe deeply about 20-60 times. They would stand up against a wall, hold their breath, and have a person press against their chest. After about 6 seconds, the person would faint, and people would catch the person. Sometimes the person who fainted would have a seizure, or do nothing at all anywhere from 2-10 seconds. Is this dangerous? What are the consequences if any?