My favorite were the ones where they were reading a WT publication in the break room at work, and an inquisitive co-worker, thirsty for spiritual knowledge approaches them. This leads to an informal witness, which eventually leads to bible study and baptism.
In all my years of working, I've never had anyone show the slightest bit of interest in what I was reading while I was on my break at work. But as I said, maybe it's just me.