It was Chuck Jones who coined the phrase "illustrated radio" to describe the excessively talky style of limited animation introduced to television by Bill Hanna and Joe Barbera in the 1960s (ironically, the two directors responsible for the inspired Tom and Jerry cartoons of the 1940s and '50s, which were almost entirely devoid of dialogue). With a good cartoon, Jones argued, it ought to be possible to watch it with the sound turned off and still "get" most of it. Watch The Flintstones or Yogi Bear with the sound off, and for the most part you'll see people standing around motionless, with fixed, stock expressions on their faces, talking to one another.
There's no denying that Hanna-Barbera television cartoons are bad. But if they're "illustrated radio", is that WHY they're bad? Certainly not in itself - because this short cartoon, directed by (who else?) Chuck Jones, is illustrated radio if anything is. Watch it without the sound and you'll miss the jokes (even the visual ones) and have difficulty making sense of it. Listen to it without the images and you'll follow what's going on easily - and it will still be funny. Moreover, what we see and here is the broadcast of a radio station quiz show, with Daffy Duck asking outrageously unfair questions of Porky Pig. If this is not "illustrated radio", what is? And yet it's one of the best cartoons ever made.
Perhaps it's misleading to point out that the cartoon makes sense without the images. To some degree the sounds imply the images. If you hear Daffy saying, "I'm sthorry, your ansthwer isth incorrect" followed by a heavy thud, part of the humour is visual: you SEE what happens, even if you have your eyes shut. The animators realise what we ought to see perfectly and (of course) outdo what we would have visualised for ourselves. The facial expressions in particular are inspired. But the carefully chosen WORDS are as crucial to the cartoon's success as any other element. The humour of Porky's desperate yet polite pleas to end the torture is almost entirely verbal - and nothing in the cartoon is funnier. Jones, despite his official stance, could easily integrate ANY kind of humour into a seamless whole, because his cartoons are always rooted in a firm understanding of character and motivation. Jones's creations NEVER step out of character. Daffy (street-wise but world-foolish, as the saying goes) shamelessly writes the rules himself; Porky (Daffy's precise opposite) gamely abides by them. Porky wins, but Jones doesn't cheat to bring this about.