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 of society which is 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 inhabitants know each other personally, the deception would be impossible.