It must be deep-rooted, so as to supply comedy with inexhaustible matter, and yet superficial, in order that it may remain within the scope of comedy; invisible to its actual owner, for the comic ever partakes of the unconscious, but visible to everybody else, so that it may call forth general laughter, extremely considerate to its own self, so that it may be displayed without scruple, but troublesome to others, so that they may repress it without pity; immediately Repressible, so that our laughter may not have been wasted, but sure of reappearing under fresh aspects, so that laughter may always find something to do; inseparable from social life, although insufferable to society; capable-in order that it may assume the greatest imaginable variety of forms-of being tacked on to all the vices and even to a good many virtues.
"Laughter: An Essay on the Meaning of the Comic"
Henri Bergson