When a nice, young woman I met out in field service invited me into her home. She was a very enthusiastic Christian and we had a lovely conversation about the Bible. As I left, I realized that she was just like me, except that I had the one true religion, and hers was a lie from Satan.
When a CO gave a talk stating that JWs shouldn't expose themselves to any critique of the WT because it could cause them to leave the organization, implying "the truth" couldn't stand up to criticism.
When I saw what a nice person one of my coworkers was, but realized that Jehovah was probably going to kill her at Armageddon.
When I read Steven Hassan's book, "Combatting Cult Mind Control," and realized that the WT wasn't the only group who thought they had the corner on truth and everyone else was living in the dark.
When my then father-in-law said, " 'Where else would we go?' is not a reason to stay a JW!"