A Connecticut Yankee in King Arthur's Court, Part 3.
And when it had got to the worst, and it seemed to me that I could not stand anything more, a fly got in through the bars and settled on my nose, and the bars were stuck and wouldn't work, and I couldn't get the visor up; and I could only shake my head, which was baking hot by this time, and the fly--well, you know how a fly acts when he has got a certainty--he only minded the shaking enough to change from nose to lip, and lip to ear, and buzz and buzz all around in there, and keep on lighting and biting, in a way that a person, already so distressed as I was, simply could not stand.