Emin's "Unmade Bed" - pretty sure that, eg from the title, was cocking-a-snook at the establishment in a "let's see what crap I can make them buy". Though it does have a place in an area of art that intrigues me, that of "uncreated" or "unconsciously created" works.

If you think Duchamp was pulling a fast one you'll probably think Emin to be some sort of queen of hustlers.