Usually, my brilliant response is "nothing."
There was one time I was staring into his eyes and thinking about how very, very blue they were, and strange how I had never really noticed that but yet my unconscious had because I'd just had this dream a few nights back in which I was looking into his eyes and they were blue. And I thought how very cool that my unconscious had noticed that T had beautiful blue eyes whereas my conscious had not really known that, etc. And he asks me "what are you thinking?"

And I said "oh, nothing." AAAACKKK!