I'd probably ask the dog why he sticks his head out the window of a moving car, but is offended by the hair dryer. Also, it would be interesting to learn the value of sniffing other dogs' asses, why he won't swim when every other dog I know loves to do so, what he would actually DO with the bigger dog if I let him off the leash to run towards him and other such basic behavioral questions.
It would also be interesting to hear what questions and comments the dog might make towards me- that's what would be most interesting- how does he THINK?