if the bump cars represented frivolity of thought , then the roller coaster represented seriousness ( which would turn to humor , since one could never help but laugh when experiencing the outrageous danger of the swoop and pitch of each fall , each acceleration down an incline that could start , as if like a machine , one 's diaphragm into the peristaltic contractions of a laughter which would increase by what it fed onlike a sheep kept in suburbia to keep one 's front lawn clipped ! ) .