Broadcast Law Blog on a timely example where myth becomes de facto law:

But perhaps the greatest misimpression of the Carlin routine is the widely held belief that there are in fact Seven Dirty Words that you can never say on the air.  In fact, that is not and has never been the FCC’s holding.  In fact, until recently, there were no words that were specifically banned on the air – all had to be evaluated by context.

Yet, over the years thousands of broadcasters have looked to Seven Dirty Words for guidance. I’ll be a number of FCC counsel have, too.