All practical jokes, friendly, harmless or malevolent…

““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. […] 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.””

— W.H. Auden