In what ways might have Mao's Cultural Revolution destroyed China's sense of humor?

I'm working on a satirical political cartoon, and could use some input, such as:
Who is the greatest clown in China's history? Is there a caricature of this person's image available?

Of course, I am presuming the Chinese HAD a sense of humor before that CCP-proscribed event.
I could be wrong.
http://www.youtube.com/watch?v=RRNTQvXSsfA
http://www.youtube.com/watch?v=sDkhzHQO7jY

R.I.P., Robin and George