Doonesbury by Garry Trudeau for November 11, 1977
Transcript:
Roland: Zonker Harris, you're widely regarded as an astute observer of the local campus scene... Zonker: Yes, this is true. Roland: Tell us, then, Zonker, what's happening there these days? Is there anything going on that has people concerned? Zonker: Hey, look, if you're trying to get me to comment on the wife-swapping at the faculty club parties, you can just forget it! Roland: Close-up, Alan! In tight on him! Zonker: You'd just blow it up all out of proportion!
Likely the first time I saw “this is true” in print, after hearing it for a couple of years.