Several years ago when I worked fiber optic maintenance, I was working with a small town telco, and the backhoe operator and his spotter were about 400 yds away starting to clear a fence line before we could begin work. Suddenly, we see the backhoe operator and spotter come running like maniacs towards us, so we all take off running in the same direction without asking questions. I remember thinking that they must have hit a gas line and were running before it blew, but it turned out that they had uncovered a huge hornet's nest with the backhoe. I don't think I have ever run that fast in my life.
I think the spotter was stung a few times, but that was all.