The first time I learned about PhD, I was about 8-9 years old. I had no idea about English Language and asked some one, who I thought has a PhD, about its meaning. He told me it means "permanent head damage". Well, I thought he is not taking me serious and is just making fun of my curiosity as a kid!
Years passed and I learned he was not able to finish his PhD. Now that I am in this path my self, I can see how hard it can be. I give people the right to leave it and get back to their life. Because if PhD is not a pile of [shit] higher and deeper, it definitely brings you a permanent head damage.