I had a ground hornet nest about 23 years back (was a teenager so I got drafted into lawn mowing detail). Had no idea they were there (or how nasty hornets could be). Felt a sharp stabbing pain in the back of both my knees, reached around, found a hornet and crushed it with my hand. There were a couple more I swatted away. Between them all I got hit with seven individual stings, all in the back of the knee space. Spent the night at a friends house flirting with what felt like an asthma attack (suspect I was close to anaphalactic issues, but I was 18 and stupid so didn't go to a hospital). Used a poultice made of a baking soda, crushed up tobacco and spit to leech out what I could.
Went back the next day with WD40 and a zippo. Got the flying ones first and then fire in the hole. Was really not the brightest thing but as mentioned, 18 years old, and my folks were out of town. Felt damned good.