The first time anybody in the Peanuts cartoon strip called Charlie Brown a blockhead was on 9 June 1958. Charlie was pitching for the local nine and Lucy was the manager. Linus, the catcher, sez "The championship is ours!" Patty sez "You can do it, Charlie Brown. We're all behind you." Lucy sez "That's right. We're with you, Charlie Brown. Pitch it to 'im, boy. Strike him out ..." And then she covers her mouth with her glove and whispers in his ear "...you blockhead!"