“It is — or seems to be — a wise sort of thing, to realise that all that happens to a man in this life is only by way of joke, especially his misfortunes, if he have them. And it is also worth bearing in mind, that the joke is passed round pretty liberally & impartially, so that not very many are entitled to fancy that they in particular are getting the worst of it.”

A letter to his wife Polly (October 1938) http://bernie.cncfamily.com/sc/excalibur.htm, quoted in Bare-faced Messiah: The True Story of L. Ron Hubbard (1987), p. 81 http://www.discord.org/~lippard/bfm/bfm05.htm#81.
Context: Living is a pretty grim joke, but a joke just the same. The entire function of man is to survive. The outermost limit of endeavour is creative work. Anything less is too close to simple survival until death happens along. So I am engaged in striving to maintain equilibrium sufficient to at least realize survival in a way to astound the gods. I turned the thing up so it's up to me to survive in a big way... Foolishly perhaps, but determined none the less, I have high hopes of smashing my name into history so violently that it will take a legendary form even if all books are destroyed.

Der alte Goethe: er war so pünktlich. Er schrieb damals auch vieles, was sehr pünktlich war. Das Runde ist langweilig. Dreh es wie du willst, es bleibt rund und schön.
Ich liebe Ecken, Kanten und Risse.
Ich lege ihm ein Bild von Dostojewski vor. Wie zerrissen, wie zerfurcht und zerhauen!
So sieht auch Michelangelo aus; ein Dulder- und Prophetengesicht.
Michael: a German fate in diary notes (1926)

Raja Bahadur, his friend
You can see God in him at times (22 December 1999)

Amy Leatheran
Murder in Mesopotamia (1936)

Source: Charles Dickens (1906), Ch 4 : "The Pickwick Papers"

Sometimes attributed to Winston Churchill, it is in fact a slight misquote of "A joke's a very serious thing" from the 1763 poem "The Ghost" by Charles Churchill.
Misattributed

Book IV, line 1386
The Ghost (1763)

The Educational enterprise in the Light of the Gospel (13 November 1988).
Context: Churches also have their problems with a Jesus whose only economics are jokes. A savior undermines the foundations of any social doctrine of the Church. But that is what He does, whenever He is faced with money matters. According to Mark 12:13 there was a group of Herodians who wanted to catch Him in His own words. They ask "Must we pay tribute to Caesar?" You know His answer: "Give me a coin – tell me whose profile is on it!." Of course they answer "Caesar's."
The drachma is a weight of silver marked with Caesar's effigy.
A Roman coin was no impersonal silver dollar; there was none of that "trust in God" or adornment with a presidential portrait. A denarius was a piece of precious metal branded, as it were, like a heifer, with the sign of the personal owner. Not the Treasury, but Caesar coins and owns the currency. Only if this characteristic of Roman currency is understood, one grasps the analogy between the answer to the devil who tempted Him with power and to the Herodians who tempt Him with money. His response is clear: abandon all that which has been branded by Caesar; but then, enjoy the knowledge that everything, everything else is God's, and therefore is to be used by you.
The message is so simple: Jesus jokes about Caesar. He shrugs off his control. And not only at that one instance… Remember the occasion at the Lake of Capharnaum, when Peter is asked to pay a twopenny tax. Jesus sends him to throw a line into the lake and pick the coin he needs from the mouth of the first fish that bites. Oriental stories up to the time of Thousand Nights and One Night are full of beggars who catch the fish that has swallowed a piece of gold. His gesture is that of a clown; it shows that this miracle is not meant to prove him omnipotent but indifferent to matters of money. Who wants power submits to the Devil and who wants denarri submits to the Caesar.

Source: World of the Five Gods series, The Curse of Chalion (2000), p. 313