There was enough straws to constitute a broom stick but the two that solidified my never returning to JWism was twofold.
I'd decided to go back to school as I saw no future in the work I was doing and looking down the corrider of time, I knew I needed to make better money. Two elders came to my house, at the invitation of my wife I suspect though she denies, and basically told me that I was wasting my time and that it would be better spent making meetings and going in field service....in theocratic pursuits. Realizing that theocratic pursuits don't pay bills, I went to school anyway.
The camel's back breaker though was, I don't remember how much later, a conversation I was having with my wife where she was railing on me for not going to meetings and insisting that I knew it was the truth....what else is out there. She was going on and on and wouldn't stop and caused me such stress that day that I actually went into the bathroom and started throwing up. Now, you would think me coming out the bathroom with vomit down the front of my shirt would stop her......
Nope, she kept right on going where she left off. At that point, I lost totally it. She finally got the message and dropped it.