I was power-trimming weeds beneath a large tree in our backyard when I felt a painful, burning jab to the back of my skull. Turning, I noticed several hornets buzzing around me. Having been already stung by one, I fled the scene. Later that night I discovered I had bumped the hornets’ watermelon-sized nest with my head! A sting had snapped me out of my clueless state, one that could have resulted in me being swarmed and stung repeatedly.