How about "The Rocking Horse Winner" by D.H. Lawrence? The rollercoaster creakily climbs to the whispers "There must be more money", crests when the boy discovers that he can pick the winning horses if he rides his rocking horse to a frenzy, and then it's following the frenzy downhill from there to the accompaniment of the same whispers growing to shreiks of realization that for some people there is just never enough.