One time when I was really young, I was riding an old thoroughbred mare on a trail. It was in a lesson, so my instructor was on foot and several other young children on horses and ponies. My mount's name was Allie... she was tall, swayback, and blind in one eye. I only rode her in a halter and leadline. So there were these people with a huge property that they let us trail ride on. We were heading home and walking down their driveway towards the road we would take to get back (the place I rode was just down the street). All of a sudden I felt Allie's muscles bunching up and she lifted her head. The next moment, she bolted for the road. For several moments I froze in the saddle, pulling as hard as I could on the makeshift reins. I could hear my instructor shouting "pull left! pull left!" I was terrified but just as Allie was about to reach the road, I hauled on the left "rein." At last she turned, just before putting her two front hooves in the path of an approaching car. I got her circling in a neighbor's yard, but whe had come so close to running into a busy road!
Every ride, good or bad, teaches you something new.