“But if there weren’t any experts would there be any fakers?”

A friend once showed a Picasso to Picasso, who said no it was a fake.

The same friend brought in another would-be Picasso from another source and Picasso said that too was a fake.

Then yet another from another source. Also fake, said Picasso.

But Pablo, said his friend, I watched you paint that with my own eyes.

Haha, said Picasso, I can paint false Picassos as well as anybody.

— from F for Fake (Orson Welles)