Peanuts by Charles Schulz for December 14, 1976
Transcript:
Sally stands in front of the class and says, "A man in a truck drove to the zoo."<BR><BR> Sally continues, "He said to the zoo keeper, 'I've got some good gnus for you and some bad gnus for you!'"<BR><BR> Sally laughs hysterically.<BR><BR> Sally sits at her desk and says, "Another 'C-minus'!"<BR><BR>
When this was on “The Charlie Brown and Snoopy Show” I never understood why Sally laughed and in the show, she drew onto what looked like two pictures of cows. But it turns out they were supposed to be gnus.