When people ask me things like "If you were to draw something, right now, what would it be?" I stare at them, my mind a train-wreck of immobility and all I can do is say "I don't know."
I have no idea what I would draw. I have nothing popping into my head. And, if I allow images to pop into my head, they'll be contrived and not spontaneous.
This sort of thing happens to me all the time.
Hell, it happens to me a lot when people think they're being polite and say something like "How are you?" I sometimes just look at them and shrug or say "Beats me" because nothing comes to mind as an answer to the question.
Dave