I don't know about "more than anything else" but I got my first "witness" from a guy at work who was just beginning to study with the JWs... we both worked in a restaurant... he was a cook, and I was one of the waitresses... and he was reading a BOOK one day in the kitchen, and I was shocked out of my gourd that he was actually "Reading" ANYTHING since those were back in the days, age mid-20s, when we all were "wild and crazy" party-time, etc.
Anyhoo, so I asked him, "WHAT are YOU reading?" (Turns out it was the blue "Truth" book). And he began to tell me about the Lord's Prayer, and what it meant, line by line (because I had been raised a Catholic and didn't know squat), I was fascinated that God had a name, that the Kingdom was real, and that God was going to eventually "fix" everything that A&E messed up in the Garden.
Later we took a few hikes and he told me other stuff he was learning all about Nebuchadnezzar and the "march of the world powers," etc.
I went with him to visit some of his JW friends, and when he had a few of them over for dinner and he invited me I went (and really was "impressed" by the prayer before dinner). Also he eventually tried to "sick the sisters on me" during that time frame to set up a study, but I wasn't ready to "commit" to anything, so he gave me a Bible, the green Make Sure book, a blue Truth book, and after a few months when the restaurant closed we lost contact. But I never forgot the few things he told me, so it would be two years later when I actually picked up that Bible and started reading it myself, and a few months after that, then I myself went seeking out the JWs! (By this time that guy had moved away, but all the JWs knew him).
That's the short version...
And one you probably don't hear everyday, lol, that somebody actually went SEEKING OUT the JWs themselves. Duh!
Live and Learn the Long SLOW Way!
/abbagail