Amusement rides most often live up to their name, but some people do get hurt or even killed while attempting to have fun. This page from the Consumer Product Safety Commission provides statistics on those types of incidents.
also links to a Directory of Amusement Ride Safety Officials that has
an entry for each state. If ride inspectors, ride operators, and the
riders themselves all stay aware of safety, the worst possible impact of
an amusement ride should be that you'd lose your lunch rather than your