Doonesbury by Garry Trudeau for May 21, 1971
Transcript:
Rufus: Hey, Mike. How do you like my new alligator shoes? Mike: Really spiffy, Rufus. But where'd ya get the money to buy them? Rufus: Used my head to get it, Mike. I finally decided to stop messing around and put this education you've been giving me to work. Remember all those math and history books you gave me which I just wouldn't read? Mike: Yeah? Rufus: I sold them.