Doonesbury by Garry Trudeau for August 17, 1974
Transcript:
Mike: So what's your theory on Leonard, Bernie? Bernie: I don't know, Mike. Maybe we just accept it. Mike: Yes, but can onen fully accept the fact that one knows a frog that actually talks? Bernie: With superb diction, I might add. I think we should just admit that there are some areas of animal behavior that are still relatively unexplored. Mike: Hmm... what do you think, Leonard? Leonard: I think you're both crazy.
Don’t be silly, everyone knows frogs don’t talk; just ask Gaspode the Wonder Dog.