Boobs, I guess.
My left one is named Paul.
One day about 10 years ago or more, my husband leaned over, directed his voice towards my left breast and said, "'Ello, Paul." I said, "After all these years, you have decided to name them?"
He had no idea what I was talking about. I was wearing a Beatles T Shirt and Paul was over my left breast. We thought about naming the right one "John" but thought the better of it.
So, we joke that only the left one is Paul.