If you're telling a joke, you don't want emotional context switching. A quick explanation, laughter might be preserved (so the above pun may or may not inhibit the execution of the original joke).

But every joke has an emotional gravity and the longer you compliment it with other emotions (e.g. intellectual explanations), eventually escape velocity is reached and you're in an entirely different emotional state.

Airplane! has three laughs per minute on average (https://www.forbes.com/sites/andrewbender/2012/09/21/top-10-...). That's not much time pull in other emotional states. And that's on purpose.