For me it was a documentary on some cable channel. My oldest daughter was probably 18 mos old. I hadn't been to a meeting in probably 3 years, but still had a BUNCH of angst about the whole thing-at this point especially the "fact" that my lack of faith was going to doom my child.
Then I saw this show about orphanages in Russia. There were these beautiful, innocent children living in horrific conditions: filthy, no medical care, not enough food, physical abuse, etc. I was angry with the Russian officials who were living in relative luxury and allowing these poor children to suffer so. Then I got to thinking about how Jehovah-a reportedly omnipotent god-was allowing this horrible suffering and millions more examples of suffering around the globe so he could win his cosmic bet with Satan.
I decided then that, if there was a Jehovah, he was a monster and not something that I could worship.
I let alot of fear and anger go at that moment.