The first time I ever heard the term “troglodyte” was years ago when I read “The Time Machine” by H. G. Wells. If “Cliff’s Notes” is correct, be particularly careful in the evening, especially around the dinner hour:

“In the world of the Eloi and Morlocks, society was divided into two new races, both degenerate and sub-human. The Eloi, the descendants of the leisured classes, have become child-like androgynous creatures, weak and unable to fend for themselves. Their lives of leisure are enjoyed only at the cost of premature death, at the hands of the cannibalistic Morlocks. The Morlocks, the descendants of the working classes long-ago driven into subterranean factories, have degenerated into troglodytes, still with some intellectual capacity, but emerging at night to prey on the hapless Eloi.”