Who Made It?

Tonight I watched a documentary on Einstein. My eleven year old said something about him. I said, "Do you know what Einstein invented?"

He said, "No."

I said, "Einstein invented puppies."

He said, "That's stupid."

I said, "Two years ago you told me that."

I repeated a lot of our conversation of two years ago. He insisted that Einstein invented puppies. Einstein invented dogs. Einstein invented houses. Einstein invented trees."

I said, "Is there anything that Einstein did not invent?"

He said, 'No."

So, being the mathematically minded guy that I am, I applied recursion. I said, "Who invented Einstein?"

He said, "Einstein's ghost invented Einstein!"

He did not remember any of the conversation from two years ago. He accused me of dreaming up the whole thing.