what does clarisse think of montag

I don't know exactly how much Clarisse knew about Montag before they actually met. Clarisse is a very perceptive free spirit, something very uncommon during this time. I think she senses that Montag is unhappy because this is one of the first topics that she brings up with him. This perplexes Montag because, at first, he really isn't sure. Clarisse must have seen enough potential in Montag to begin talking to him in the first place. She watches people as kind of a hobby and examines the subtext that other people miss,

"...I like to watch people. Sometimes I ride the subway all day and look at them and listen to them, I just want to figure out who they are and what they want and where they're going...Or I listen at soda fountains...People talk about nothing..."

Clarisse must have known Montag's potential to expand his mind. She must have had an idea that this guy might look around his world and re-define it.