Basically what happens is what dolphingirl says.
I'm not one to lead a discussion.. If left up to me, I'd sit in silence for an hour (seriously, I have no problem with that).
However, I hate it when she asks what I want to talk about. I think she knows that because I wince when she does.
The issue is that yeah, ok... fine... I'm talking about this, but when I try to lead the conversation into another topic, she brings it back.
It's not that she controls it, but she gets all caught up on the first thing I say...
Good thing sometimes, not so great sometimes.
And I'm not one to just dive into something either -_-

The idea of the red card seems funny though!
She's a big supporter of soccer- so I'll walk with a whistle, a red and yellow card and say, "Foul!"
This I know because during a tournament, my favourite team was playing hers; she wore her team jersey, so did I.
We spent a few minutes laughing about it...