The are dozens of Carlin quotes I've memorized over the years, notable his monologue about the famous "Baby On Board" yellow car window signs of the late 1980s:
"... instead of 'Baby On Board,' how about an honest sign, like, 'Assh*le at the wheel!'? They could give those out free to people who drive Volvos and Saabs."
According to Wikiquotes, it turns out Carlin took on the legitimacy of a few Olympic sports, too. Given today's unfortunate incident involving a downtown Atlanta MARTA police team, Carlin's comments on boxing seem timely:
"Boxing is not a sport. Boxing is a way to beat the sh*t out of somebody. In that respect, boxing is a more sophisticated form of hockey. But beating the sh*t out of somebody isn't a sport, in spite of what the police think. When police brutality becomes an Olympic event, fine, then boxing can become a sport."
On sports, I think he punctuated his thoughts on competition with the notion that, "It's never 'just a game' when you're winning."
Just a few months ago, when George Carlin played a packed house at The Fox Theatre in Atlanta, he did not really touch on sports and 'stuff' (unfortunately, his final 20 minute rant was a bit much).