"What Cha-gall!"

That's the lede to this New York Post story on a state court lawsuit by collector Joy Glass against art dealer Lyn Segal:

"The painting came with a certificate of authenticity from the Comité Chagall -- a French group recognized as the ultimate authority on Chagall's works. But in January 2009, the group told Glass that both the painting and certificate were fake, the suit said."