O: That's impossible, isn't it?
Q: Coward.
O: I don't think so.
Q: No.
O: You seem a little on edge.
Q: Not likely.
O: Curious.
Q: Thanks, my young friend.

It's the dialogue between the two, it just doesn't make sense to me, but maybe I'm just not getting it. I'm fine up until he says "No" in response to "I don't think so".

And then after he says "Not likely" to being on edge, why does Obi Wan say curious? And then Qui Gon thank him for it? How about this:

O: That's impossible, isn't it?
Q: Coward.
O: You seem a little on edge.
Q: Not likely.

But I agree with fishmanlee, the interruption scene was brilliant