What you can and can't say on television

A few weeks ago I spoke at a comedy symposium at U.C. Santa Barbara (along with other panelists the students had actually heard of).  There was a good crowd, several hundred at least -- all the more impressive because the surf was really up that day.  During one of the panels (not mine), they showed a clip from an ALL IN THE FAMILY episode from the early '70s.  It's the famous scene where