In the 1970s, Carlin became known for unpredictable performances. He would walk off if no one laughed, verbally insult the audience, or simply not appear.
Eventually, Carlin changed both his routines and his appearance. He lost some TV bookings by dressing strangely for a comedian of the time, wearing faded jeans and sporting a beard and earrings at a time when clean-cut, well-dressed comedians were in vogue. Using his own persona as a springboard for his new comedy, he was presented by
Ed Sullivan in a performance of "The Hair Piece," and quickly regained his popularity as the public caught on to his sense of style.
In this period he also perfected what is perhaps his best-known routine, "
Seven Words You Can Never Say on Television", recorded on
Class Clown, a routine which offended some. Carlin was arrested in 1972 at
Milwaukee's Summerfest and charged with violating
obscenity laws after performing this routine. In 1973, a man complained to the
FCC that his son had heard a later, similar routine, "Filthy Words", from
Occupation: Foole,
broadcast one afternoon over
WBAI, a
Pacifica Foundation FM radio station in
New York City. Pacifica received a citation from the FCC, which sought to fine Pacifica for allegedly violating FCC regulations which prohibited broadcasting "obscene" material. The
U.S. Supreme Court upheld the FCC action, by a vote of 5 to 4, ruling that the routine was "indecent but not obscene", and the FCC had authority to prohibit such broadcasts during hours when children were likely to be among the audience.
F.C.C. v. Pacifica Foundation, 438 U.S. 726 (1978). Ironically, the court documents contain a complete transcript of the routine, perhaps validating what
Oliver Wendell Holmes, Jr. said: "You cannot define obscenity without being obscene".
The controversy only increased Carlin's fame (or notoriety). Carlin eventually expanded the dirty-words theme with a seemingly interminable end to a performance (ending with his voice fading out in one
HBO version, and accompanying the credits in the
Carlin at Carnegie special for the 1982-83 season), and a set of 49 web pages organized by subject and embracing his "Incomplete List Of Impolite Words".
Carlin was the first-ever host of
NBC's
Saturday Night Live, debuting on
October 11,
1975. (He also hosted
SNL on
November 10,
1984, where he actually appeared in sketches. The first time he hosted, he only appeared to perform stand-up and introduce the guest acts.) The following season, 1976-77, Carlin also appeared regularly on
CBS Television's
Tony Orlando & Dawn variety series.
Carlin unexpectedly stopped performing regularly in 1976, when his career appeared to be at its height. For the next five years, he rarely appeared to perform stand-up, although it was at this time he began doing specials for
HBO as part of its
On Location series. His first two HBO specials aired in 1977 and 1978. It was later revealed that Carlin had suffered the first of his three
heart attacks during this layoff period.