Manual of Fear and Death

The first AD&D book I ever owned was the Monster Manual. I bought it with money my grandmother had given me for Christmas 1979, ordering it through the Sears catalog. Once my copy arrived, sometime in early January 1980, I spent untold hours poring over its contents. Though I, of course, loved all the descriptive material contained in the book's 112 pages, it was the illustrations that truly seized my imagination – so much so that, to this day, it's difficult to conceive of many Dungeons & Dragons monsters in any way other than how Dave Sutherland, Dave Trampier, Tom Wham, and Jean Wells drew them. 

One aspect of the Monster Manual's artwork that grabbed my youthful attention was how often it depicted fear and death. Consider, for example, the piece accompanying the book's title page:

Here, we get three knights in historical armor facing off against a bulette. Beneath the landshark's front right claw, you can see the corpse of a horse (perhaps belonging to one of the two unmounted knights in the foreground). It's a small detail, seemingly unimportant, but it's the first example of a recurring motif in the Monster Manual's illustrations: facing off against monsters is perilous.
Again and again, you see this throughout the book: monsters frightening, harming, or killing those who dare to challenge them – often in unexpected places, like this one. Those are giant ants and look how they use their large numbers to overwhelm their opponents, as do stirges in another memorable illustration. Of course, not all low-level monsters rely solely on numbers to get the better of their enemies. Take a look at this pixie. Being surprised by a lurking monster is another common element of Monster Manual illustrations, like the classic mimic preparing to punch the unfortunate thief attempting to open a "chest." But there are many others in this style as well.
I could offer many more examples from the book and I'm sure readers will remember some of their own favorites. I adored these kinds of illustrations as a younger person, in large part because they emphasized the danger posed by monsters, even things as seemingly innocuous as giraffes. Everything in the Monster Manual was a potential threat to life and limb and I can't tell how exciting that was to me as a budding Dungeon Master. While I was never a killer DM, I nevertheless did revel in seeing the looks of horror on players' faces as they realized what their characters were up against. Descending into a dungeon or wandering off into the wilderness is supposed to be frightening to some degree. A big part of the appeal of games like D&D, especially for young people, is being able to face those frights vicariously. That's part of why horror movies continue to be so popular, I imagine, particularly as the real world becomes ever safer and more sanitized. Something in our nature atavistically craves, maybe even needs fear and danger. Monsters in fantasy roleplaying games should give us a chance to experience both.