My dear Wormwood, this is funny (to *us*)

Conversation between two Demons

"My Dear Wormwood,

Everything is clearly going very well. .... You speak of their being great laughers [these humans]. I trust this does not mean that you are under the impression that laughter as such is always in our favour. This point is worth some attention.

I divide the causes of human laughter into Joy, Fun, the Joke Proper, and Flippancy. You will see the first among friends and lovers reunited on the eve of a holiday. Among adults some pretext in the way of Jokes is usually provided, but the facility with which the smallest witticisms produce laughter at such a time shows that they are not the real cause. What that real cause is we do not know. Something like it is expressed in much of that detestable art which the humans call Music, and something like occurs in Heaven - a meaningless acceleration in the rhythm of celestial experience, quite opaque to us. Laughter of this kind does us no good and should always be discouraged. Besides, the phenomenon is of itself disgusting and a direct insult to the realism, dignity, and austerity of Hell.

Fun is closely related to Joy - a sort of emotional froth arising from the play instinct. It is very little use to us. It can sometimes be used, of course, to divert humans from something else which the Enemy [God] would like them to be feeling or doing: but in itself it has wholly undesirable tendencies; it promotes charity, courage, contentment, and many other evils.

....

The real use of Jokes or Humour is in quite a different direction, and it is specially promising among the modern generation who take their "sense of humour" so seriouisly that a deficiency in this sense is almost the only deficiency at which they feel shame. Humour is for them the all-consoling and (mark this) the all-excusing, grace of life. Hence it is invaluable as a means of destroying shame. If a man simply lets others pay for him, he is "mean"; if he boasts of it in a jocular manner and kids his friends with having been taken - he is no longer "mean" but a comic. Mere cowardice is shameful; cowardice boasted of with humourous exaggerations and grotesque gestures can be passed off as funny. Cruelty is shameful - unless the cruel man can represent it as a practical joke. A thousand bawdy, or even blasphemous, jokes do not help towards a man's damnation so much as his discovery that almost anything he wants to do can be done, not only without the disapproval but with the admiration of his fellows, if only it can get itself treated as a Joke. And this temptation can be almost entirely hidden from your patient by that modern seriousness about Humour. Any suggestion that there might be too much of it can be represented to him as "Puritanical" or as betraying a "lack of humour."

But Flippany is the best of all. In the first place it is very economical. Only a clever human can make a real Joke about virtue, or indeed about anything else; any of them can be trained to talk as if virtue were funny. Among flippant people that Joke is always assumed to have been made. No one actually makes it; but every serious subject is discussed in a manner which implies that they have already found a ridiculous side to it. If prolonged, the habit of Flippancy builds up around a man the finest armour-plating against the Enemy that I know, and it is quite free from the dangers inherent in the other sources of laughter. It is a thousand miles away from Joy: it deadens, instead of sharpening, the intellect; and it excites no affection between those who practise it."

-from Chapter XI of C.S. Lewis' The Screwtape Letters