BORN TO FEAR, page 78, in the section Work Not Done?: An Interview with Thomas Ligotti
Wagner: … We’ve detected a priceless humor in My Work Is Not Done (as well as in many other of your stories). We guess you’re not a “happy” person. We suppose this kind of homo sapiens which thoroughly enjoys existence In a world like ours is as fishy to you as to us. But what about Thomas Ligotti’s sense of humor in real life? Do you face everyday’s madness with a grin?
Ligotti: To my mind, a well-developed sense of humor is the surest indication of a person’s humanity, no matter how black and bitter that humor may be. If you think of the real bastards in world history as well as those with whom you are personally acquainted, they are people who invariably have no sense of humor. And they will often regard your sense of humor as “inappropriate.” Humor is the mark of their enemy.