Black Flies..
Did some field work years back in Canada north of Lake Superior. It was May, and the Black flies were waxing. Nearly lost what sanity I had left. Neither cigarettes (I'm years smoke free now) nor cigars nor insect repelent, nor curses, nor appeals to the divine powers would keep those beasties outta my eyes. Advice from the local guide? "When your eyes swell up you'll not feel it anymore."
