You are correct about 5150 coming from California. I n wha only lived in California for 15 months on a temporary job. It was earlier in my life and I had not yet been diagnosed. But I knew what 5150 meant, and because I have been involuntarily committed on a couple of occasions, I used it in my nickname. I also have a tattoo showing a manic jokers face, and also shows a pill bottle with all of the pills being thrown away, and the number 5150 is beneath all of it. I like using it because most people don’t know what it means!