From George Carlin's website:
http://www.georgecarlin.com/home/bogus.html
"The following is an email making the rounds that George Carlin did NOT write.
Subject: A Bad American
I Am Your Worst Nightmare. I am a BAD American.
I am George Carlin. ..."
In other words, check
http://www.snopes.com/politics/soapbox/carlin.asp....