European wasps! Very dangerous, but strangely, we've been walking around and through them for weeks without any trouble. The only time I was worried is when I took this pic - it seemed to annoy them a little, because a few of them buzzed round my head in a sort of, 'Go away' dance. I went.
Unfortunately, as they're a menace to society at large, we had to get rid of them. Pity, but there you are.