Bald-faced hornets suck. Cutting one of my fields with a tractor and sickle bar. one tree in the whole Field. Figured I could get under the tree if I leaned back in the seat. As I'm going under the tree I hit a basketball sized nest with my head. Managed to throw the tractor in neutral and jump off . With my eyes swelling shut and the tractor and sickle bar still running I said eff it let it run out of gas.