Without laughter life on our planet would be intolerable. So...

Without laughter life on our planet would be intolerable. So important is laughter to us that humanity highly rewards members of one of the most unusual professions on earth, those who make a living by inducing laughter in others. This is very strange if you stop to think of it: that otherwise sane and responsible citizens should devote their professional energies to causing others to make sharp, explosive barking-like exhalations.