Victor's posts on humor in art made me think of dissident collaborators Komar and Melamid. I've always enjoyed their work, including much their performance art, such as conjuring up fictional artists Nikolai Buchumov and Apelles Ziablov, collaborating with the population of the world when creating their Most Wanted paintings, and even their establishing Elephant Art Academies. I love their senses of humor and satire.
This is my favorite painting of theirs:

Painted in the style of Socialist Realism, a Muse is tracing Stalin's silhouette onto a wall -- she's creating art which conforms to the dark shadow that he casts as he holds her in place. I think it very cleverly mocks The Origin of Socialist Realism (which is the title of the piece). Satire in painting at its finest.
J