I recently observed Leo climb into a chair at the dining room table. He said to himself, "Off the table!" (Something he hears quite often.) To which he replied to himself, "No off the table!"
"Off the table!" he said again. "No off the table!" was his response again.
This intra-Leo argument went on for a minute or two. Then he climbed down from the chair and wandered off.
No wonder he is so good at protesting. He practices.