More often than not, the response is something like, "I don't know" or "I wasn't thinking of anything." Then, when I ask "Did you hear what you did there?" I get "I wasn't listening" as a response.
I wrote that post-it love note to one student who usually answers, "I don't know. I just go on autopilot." I've told him that it's dangerous to not listen to what you're doing.
As musicians, we are creating sound pictures. If we aren't even paying attention to what we are creating, how do we even know if it's any good? Or whether we are getting any better?