It is fun to bicycle ride on the hilltop where the wind blows strong all day long. Jack and Simes seldom ride the road that goes round and round, curving in and out, going down, down, down. Because Jack and Simes know what goes down, down, down from the hilltop must go up, up, up--pushing the bicycles up, up, up the long winding hill is no fun. Until Grandpa's shirt makes going up, up, up fun.