For the people who left out of the blue, What made you leave the organization?
I was born in, thought about getting baptized in my teens but didn't take the dunk. To answer your question, it just never added up, or really resonated with me. In my early 20s I felt that the Witness mentality was preventing me from growing intellectually AND spiritually. Up until about 20, I pretty much though of myself as a witness (even though technically I wasn't, since I wasn't baptized), but by my mid-20s I totally distanced myself from it. I read a lot about the history of the religion, and that completely broke the spell.
So no nightmare scenario in my case, it was a slow realization that it wasn't the 'truth'. I'm still on good terms with my family and most JWs I know, even though there's some tension there if the religion comes up. I'm very happy to be completely out. My heart goes out to those who were baptized, and who left later in life. I can only imagine how hard it must be. peace.