Don Imus committed the greatest sin any humorist can commit: it wasn't funny. On the other hand, comedienne Sarah Silverberg got away with the following joke on the Conan O'brien show:
"I got jury duty … and I didn't want to go, so my friend said, "You should write something really really racist on the form when you return it. Like, you should put 'I hate chinks'." And I said, "I'm not going to put that on there just to get out of jury duty. I don't want people to think that about me." So instead I wrote, "I love chinks." And who doesn't?"
She still has her show.