They come, stay a few weeks, and then they go.
Quick, everyone run around waving their hands and screaming.
I swear, we need a good typhoid outbreak to dynamite people into some perspective.
I’ve never been in New England in black fly season but I’ve spent several summers in Vermont and you always have one or two of the things left over. And when one of them comes after you, you absolutely have to stop whatever you’re doing until you manage to kill the black fly. As is the case with bees and hornets, a tennis racquet does a nice job on them.