Sir, What Mischievous Things Did You Do When You Were in School?

One day, our Head Master was teaching geography. During the class, after observing us, probably he felt some of us were not very attentive in the class. He told us that you should climb the running train. I replied immediately that if we climb the running train, we will fall and will get injured. He have me a good bashing. What he meant was, we should learn as he is teaching instead of understanding that way; I physically thought he is asking as to climb a moving train.