One Got Fat (1963)

Ten youth, all close friends, decide to cycle to a park nine blocks away to have a picnic lunch. As they proceed on their journey, they have to remember and pay attention to the many aspects of being a responsible cyclist and bicycle owner. These aspects include using correct hand signals to signify cycling intention, obeying traffic signs and signals, keeping to the correct side of the street, registering one's bicycle by licensing it, riding one person to a bicycle, not riding on sidewalks where prohibited and yielding to pedestrians wherever riding on sidewalks is allowed, keeping one's bicycle in good working order by having it tuned whenever required, and having lights and/or reflectors for dark situations which includes riding through unlit tunnels during the day. Acting the responsible human or the irresponsible "monkey" will affect who of the ten will arrive safely if at all to the park for the picnic.