Yellowjackets are my favorites. They love picnics because they eat meat, and when they are REALLY angry they take a big bite to hold on tight, and then sting multiple times in a circle around the bite. The grip from the bite makes it so you can't just brush them off, you have to grab and pinch off each one of the suckers one at a time. Good times.
My little brother slipped on a log while we were out camping in California, and his foot kicked a yellowjacket nest under the log. He sat there on the log screaming as the wasps swarmed him. Up his pants legs, in his mouth, up both sleeves, up and down his shirt, down his pants, in his hair and ears, everywhere.
Stupid me ran into the swarm to yank him out of there 'cause he was only 6 yrs old. Of course I was only 8 so I didn't really think it through any farther than "Hey he probably needs help getting off of that log." Amazingly, I got only one bite and zero stings. My bro took about 20 full force stings including 2 inside his mouth. Yaaay benadryl, we didn't even have to go home because the swelling went right down as soon as the benadryl hit his system. Good stuff to keep in the picnic basket and in yer camping kit...