I was hooked by the fact that the WTS seemed to have answers for everything and interpretations of Bible passages I didn't even knew existed. No one seemed to have any answers to what they said -- at least no one shared any with me.
Then I heard tapes by Walter Martin and Bill Cetnar that provided biblical answers and also exposed the WTS' false prophecies.
When elders didn't come up with satisfactory answers to what Martin and Cetnar were saying, I was on my way out.
When I showed an elder photocopies of some of the WT's false prophecies and asked for an explanation, he denounced them as apostate literature.
I asked him at what point something published in the Watchtower stopped being the truth and turned into apostate literature.
He got up and walked out on me.