Too bad Franklin didn’t study current flow a bit better. Leyden jars had been around a few years and he knew how to produce quite a spark. He also apparently knew that sharp points produced bigger sparks.
If he had tested producing sparks between a sharp point and a round object, he would have noticed that it was easier to get a spark when the point has a negative charge (as we know it) and the round thing had a positive charge. And the spark might jump around when hitting the round object.
Seems like a demonstration that something is flowing the opposite direction from his chosen direction.
And we could still have a right-hand rule if we called the end of the magnet that points to the north pole the south end. So we’d also get rid of this nonsense that the magnetic “north” pole is actually a south pole.
Add the face plant Californian hitchhiker.