The document describes a girl named Martha who is hesitant to try psycho sledding on water, a ride that simulates sledding down a wave. Her mother and the other people in line convince her it is safe since no one is getting hurt. Martha agrees to go if her father also rides it. Her father rides it twice without getting hurt and has fun, convincing Martha to give it a try. Martha loves it and asks to ride it multiple times, finding it the most fun activity at the indoor water park.