When a high school student spotted his own school bus broken down by the side of the road, he quickly decided he couldn’t let a good opportunity go to waste. Instead, he pulled over and gave the familiar bus driver a surprise he wasn’t expecting. Gavin Natti (Photo Credit: Screenshot) Gavin Natti, a Massachusetts high school junior at Essex North Shore Agricultural and Technical School in Danvers, was on his way home from the doctor on an otherw…