Thomas Hoving , former director of the Metropolitan Museum of Art has a classic final tableau is his appearance in the film Who the $#%& Is Jackson Pollock? In which he claims the piece is frivolous, a fake, with no emotion - that it's "Dead on Arrival" . But whether you believe his expertise or not, what really makes his cameo classic in this film (which I highly recommend) is the way he examines this presumably fake Jackson Pollack painting that the main character of the documentary claims she found at a thrift store. The series of stances he dons are priceless.
Here are a couple. My two favorites are when he fist walks in and will not look at the painting until he is fully seated and prepared to "take it all in at once" and when he looks at it upside down. It's a great little film