As I mentioned last night, +Tim Snider 's Timemaster game was my wife Rachel's first RPG session in a group setting (back when we were dating I ran a Tunnels & Trolls session for her one on one, but that was more mechanics of an RPG than actually understanding how an RPG works).
The magical moment when I knew it had all clicked for my wife was when she said: "We need to interrogate the last one. We need to know what he knows. I want to know how many are waiting for us on Skylab". This after she had wrestled the four armed alien into a Half Nelson.
She just remarked to me as I type this "It's a good thing I didn't use a Pile Driver, or else we wouldn't have learned anything."
Yep, she get's it ;)