"Prove to me, bb, that you don't have "The Scream" painting by Edvard Munch..."

You obviously miss the point.

Show that I HAD that painting previously, and THEN you are entitled to ask me to prove that I no longer have it- OR YOU PRESUME THAT I STILL DO.

You are beginning to act like a real shithead about this.

Prove to me that YOU are not a liar.