http://www.slate.com/articles/health_and_science/science/2015/08/hornets_and_yellow_jackets_are_aggressive_in_summer_stinging_wasps_social.html

I used to think of hornets and yellow jackets as the jerks of the animal kingdom. These stinging, flying wasps ruin countless picnics with their aggressive appetite for candy, fruit, and soda. They sting thousands of Americans every year, killing up to 100 people through anaphylactic shock. And one of them stung me three times on the face as I walked out of a campground bathroom one July. What an asshole, right?