I vaguely remember hearing about this story. (I think it's from a Molly Ivins column, from many, many years ago).
When I started my search, I came across this wonderful address to the Society of Professional Journalists from Bill Moyers on 9/11/2004.
The parable is but one part of this wonderful speech...
I’ve gone on like this not to regale you with old war tales but to get to a story that is the one thing I hope you might remember from our time together this morning. John Henry Faulk told me this story. Most of you are too young to remember John Henry -- a wonderful raconteur, entertainer, and a popular host on CBS Radio back when radio was in its prime. But those were days of paranoia and red-baiting – the McCarthy era – and the right wing sleaze merchants went to work on John Henry with outlandish accusations that he was a communist.
A fearful CBS refused to rehire him and John Henry went home to Texas to live out his days. He won a famous libel suit against his accusers and wrote a classic book about those events and the meaning of the first amendment. In an interview I did with him shortly before his death a dozen years ago John Henry told the story of how he and friend Boots Cooper were playing in the chicken house when they were about twelve years old.
They spied a chicken snake in the top tier of nests, so close it looked like a boa constrictor. As John Henry told it to me, “All the frontier courage drained out our heels – actually it trickled down our overall legs – and Boots and I made a new door through the henhouse wall.” His momma came out and, learning what the fuss was about, said to Boots and John Henry: “Don’t you know chicken snakes are harmless? They can’t hurt you.” And Boots, rubbing his forehead and behind at the same time, said, “Yes, Mrs. Faulk, I know that, but they can scare you so bad, it’ll cause you to hurt yourself.” John Henry Faulk told me that’s a lesson he never forgot. It’s a good one for any journalist to tuck away and call on when journalism is under fire.
And please, read the entire address. It will make you laugh and cry. And, now is the time to take on the chicken snake. MKJ
http://www.commondreams.org/views04/0917-02.htm