Social life also presupposes that we may believe what we are told unless we have reason to suppose, either that our informant has a serious motive for deceiving us, or that he is mad and incapable himself of distinguishing between truth and falsehood. If a stranger tries to sell me shares in a gold mine, I shall be a fool if I do not check up on his statements before parting with my money, and if another tells me that he has talked with little men who came out of a flying saucer, I shall assume that he is crazy. But if I ask a stranger the way to the station, I shall assume that his answer is truthful to the best of his knowledge, because I cannot imagine what motive he could have for misdirecting me.
Practical jokes are a demonstration that the distinction between seriousness and play is not a law of nature but a social convention which can be broken, and that a man does not always require a serious motive for deceiving another.
Two men, dressed as city employees, block off a busy street and start digging it up. The traffic cop, motorists and pedestrians assume that this familiar scene has a practical explanation—a water main or an electric cable is being repaired— and make no attempt to use the street. In fact, however, the two diggers are private citizens in disguise who have no business there.
All practical jokes are anti-social acts, but this does not necessarily mean that all practical jokes are immoral. A moral practical joke exposes some flaw in society which is a hindrance to a real community or brotherhood. That it should be possible for two private individuals to dig up a street without being stopped is a just criticism of the impersonal life of a large city where most people are strangers to each other, not brothers; in a village where all the inhabitants know each other personally, the deception would be impossible.
A real community, as distinct from social life, is only possible between persons whose idea of themselves and others is real, not fantastic. There is, therefore, another class of practical jokes which is aimed at particular individuals with the reformatory intent of de-intoxicating them from their illusions. This kind of joke is one of the stock devices of comedy. The deceptions practiced on Falstaff by Mistress Page, Mistress Ford and Dame Quickly, or by Octavian on Baron Ochs are possible because these two gendemen have a fantastic idea of themselves as lady-charmers; the result of the jokes played upon them is that they are brought to a state of self-knowledge and this brings mutual forgiveness and true brotherhood. Similarly, the mock deaths of Hero and of Hermione are ways of bringing home to Claudio and to Leontes how badly they have behaved and of testing the genuineness of their repentance.
All practical jokes, friendly, harmless or malevolent, involve deception, but not all deceptions are practical jokes. The two men digging up the street, for example, might have been two burglars who wished to recover some swag which they knew to be buried there. But, in that case, having found what they were looking for, they would have departed quietly and never been heard of again, whereas, if they are practical jokers, they must reveal afterwards what they have done or the joke will be lost. The practical joker must not only deceive but also, when he has succeeded, unmask and reveal the truth to his victims. The satisfaction of the practical joker is the look of astonishment on the faces of others when they learn that all the time they were convinced that they were thinking and acting on their own initiative, they were actually the puppets of another's will. Thus, though his jokes may be harmless in themselves and extremely funny, there is something slightly sinister about every practical joker, for they betray him as someone who likes to play God behind the scenes. Unlike the ordinary ambitious man who strives for a dominant position in public and enjoys giving orders and seeing others obey them, the practical joker desires to make others obey him without being aware of his existence until the moment of his theophany when he says: "Behold the God whose puppets you have been and behold, he does not look like a god but is a human being just like yourselves." The success of a practical joker depends upon his accurate estimate of the weaknesses of others, their ignorances, their social reflexes, their unquestioned presuppositions, their obsessive desires, and even the most harmless practical joke is an expression of the joker's contempt for those he deceives.