Question: what words are you not allowed to say on tv?
Answer: 1972 – Class Clown – Audio recording – "Seven Words You Can Never Say on Television"
1973 – Occupation: Foole – Audio recording – "Filthy Words"
1977 – George Carlin at USC – HBO special – "Forbidden Words"
1978 – George Carlin: Again! ... 
1983 – Carlin at Carnegie – HBO special – "Filthy Words"