No Dukes Of Hazard in the class room

The story:

This was 3-4 years ago, when I first got into Pink Floyd. I was in the car on the way to a hockey tournament with my mom, my friend, and his dad. My friend and I were listening to this song. He didn't know the lyrics back then either. So he sang:" We don't need know thought contra". I told him that it was "thought control". the I sang my line. I remember hearing about the Dukes Of Hazard. And I just mis-heard the lyrics. Back Home, my other friend told me that it was "dark sarcasam" and not "Dukes Of Hazard".