Rock

Suddenly reminded of an incident which we witnessed before you were born.

Your dad and I were at the beach. A man was there with several kids. One of them was throwing some stones around. The man told him repeatedly to stop. He didn't. So the man picked up a big stone. Big enough to be called a rock, lifted it up meancingly over his head and shouted at the kid, " You throw one more time I throw this at you!"

I remember we both looked at each other and started laughing!

Equivalent retaliation aka tit for tat.

Works!