Yellow jackets can sting more than once and will stay after you forever! The hubby was mowing hay in a pasture at my old barn and ran over a hive. They chased him and the tractor clear to the other end of the property. He thought he was going to have to dive in the water trough to get away from them. Good thing he found them and not the horses. Went back later that night and took care of the hive after they had turned in for the night.