Doonesbury by Garry Trudeau for February 14, 2017
Transcript:
Doctor: Group, I'm sure you all notice something different about Duke today... After ten weeks, he no longer needs his restraining jacket! Group: Bravo! Clap! Doctor: Duke's new self-control is the product of real courage and a lot of hard work, right, Duke? Duke: That's right, Doc... Also, that Novocain injection into my skull probably didn't hurt. Doctor: Now, now. Let's not alarm the other patients!
I think it had been years since they used novocaine even when this was first published.