The statement "howling with laughter requires lack of control" is true because When a being howls with laughter the body, mind, emotions and spirit become very open which can be considered a break down (or lack of control) in some societies conventional public behavior.  Laughter is _very_ healing and balancing for all beings.  It is possible that one can laugh so hard and deep that one cries tears (also healing).  Professional actors know that the same same physiological response is initiated by both crying and laughter!  Actors also know that comedy is really tragedy pushed beyond The Edge!