Doonesbury by Garry Trudeau for August 21, 1977
Zonker: And by the end of July, I knew I had it in the bag... another flawless tan! Man: How does the kid do it? Zonker: Self-discipline, a good deck chair, and imported French-cooking oil... Man: I see. B.D: And on the second down, I want... Kirby: Good Lord! Will you look at Zonker's tan! Zonker: Hee hee! Man: Wow! Kirby: I've never seen a tan so deep in my life! Zonker: Thanks, Kirby! Thank you very much! Man: Deep?! IT's practically professional, man! Zonker: It IS professional, Ralphie! In fact, I got my instructor's certificate this summer! Man: Well, you deserve it, Zonk! That tan is savage, almost primitive! B.D: Alright, already! Enough on Harris's tan! We're here to play football, dammit! Zonker: Football? Kirby: Hey, take a powder, willya, B.D! Zonker's worked all summer on his tan and we want to hear about it! Zonker: Thank you, Kirby. I appreciate that... Kirby: Have you shown it to any girls, yet, Z? Zonker: Well, I'm not sure that'd be fair, Kirby... Man: Zonker's right. A tan person has to show restraint!