Peanuts by Charles Schulz for September 26, 1970
Transcript:
Snoopy sits in the grass and turns his head. Lucy stands next to him and holds her hand out.<BR><BR> Lucy says, "It's bad luck to turn away from a 'Beep.'"<BR><BR> Lucy grabs Snoopy's nose and says, "Beep!"<BR><BR> Snoopy thinks, "I didn't know that."<BR><BR>