In the 90s I met a couple of people that were part of a small group of about 10 people in San Francisco who drank blood that they obtained from blood banks. They claimed it was legally obtained. The two people who claimed to be part of this group swore me to secrecy. I asked why me, and they said they need to tell someone to see their reaction. I thought it was very bizarre but I said nothing. When they asked me for my thoughts, I asked if they attacked anyone to drink their blood, they said no. I asked why they did it. They said for their health. It was perplexing to me. They also asked if I wanted to join them. I declined. I never saw or heard from them again.