You are off duty. At a restaurant the owner recognizes you as a police officer that patrols the neighborhood. The owner says, "Good job. Keep my restaurant safe ok?", and then writes no charge on your bill. What will you do, if anything?

I respectfully decline his offer to waive my restaurant charges only because I’m the patrolling officer. I reply back to him “ Thanks for your offer, but as an officer of the law, it is my duty to protect citizens and their rights. I cannot accept this as it is my job to do so, but thanks again.”