I was mowing earlier in a yard that I know has a ground nest but i forgot the exact spot so I accidentally ran over it again and got attacked and stung in 12 different spots! When I realized I ran over the nest I let go of the mower and ran away swinging my arms, there was 2 bees that kept with me flying around my head,but I kept swatting at them, I had to go to the truck ( about 20 yards away from the nest!!!) and got in, those 2 bees were flying around the door waiting for me to get out!!!! I tried to get out once but had to get back in, finally after about 15 minutes they were gone and I could get back to mowing!!! I have never seen such tenacious bees, usually they quit chasing after you leave the immediate area? Im sure it was a funny sight for anyone watching me!! I am so sick of getting stung, I cant remember a year as bad as this one for ground bees!?