They would send you to a hospital.

That happened to me this January. She spent 2 hours trying to get me to promise her that I will come back the next day (it was the weekend which she normally doesn't work then) but I couldn't. So she got my mom to sign a contract saying that I would be safe at home, but as soon as I got home I ran away, because I was going to do what I said and then after talking to my mom on the phone for a while, I returned home and went to the hospital.