I don't recall having to censor Corduroy or Frog and Toad, though I did have to explain that the hip-hop lingo in Shark Tale was the speech of thugs and ghetto trash.
I had to do that, too, and the response I got was "That's stupid."
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George Carlin wrote:
I think it’s the duty of the comedian to find out where the line is drawn and cross it deliberately.