Raoul Duke: My attorney understands this concept, despite his racial handicap. But do you?
Hitchhiker: Heh heh...
Raoul Duke: He said he understood, but I could see in his eyes that he didn't. He was lying to me!
The hitchhiker is obviously uncomfortable with Duke's arm snugly around his neck, with Duke and Gonzo's demeanor and with the strange conversation he's hearing.