The most interesting convo I had was about the elections in my country. It's always interesting to talk about cause we have a lover of the people on the ballot this time. And, the plans a friend of mine shared with regard to furthering his education.
I almost always have interesting conversations with people I barely know too, because if you have nothing important or interesting to say, I'd not even entertain you in the first place.
Group? Naa. I don't even know of any.