Doonesbury by Garry Trudeau for February 25, 1972
Phred: B.D., I know how hard it must be for you to accept me, what with our different backgrounds and all. I realize how you feel...you know, I even know what you'd like to call me...but you haven't said it, on account of our joint struggle for survival. But I wouldn't mind, really...go ahead and say it... B.D.: O.K. you lousy commie gook! Phred: There now. Don't you feel better? B.D.: Yes, I needed that...
Pressure reliefThanks, buddy