I used to be a professional singer, and I signed a contract with my manager. After a year of failed attempts at success and no paying gigs, I told him I wanted to quit.
He threatened to sue me for all the money he could have made off of me if I had become famous. I said that no court in the world would reward him for that, because it couldn't be proven that I ever would have made it.
Nevertheless, he took me to court. I had a lawyer who was ready to totally debunk his claims, but he never showed up that day. I suppose he had come to the realization that he had no basis for his case.
The judge called it a non-suit, and I went on my way. I was greatly relieved, even though I didn't believe that I would end up owing him anything.