SimAnt/YMMV


 * Nightmare Fuel: The Spider and the Lawnmower. Horrible, horrible things.
 * You can take out the spider and the ant-lions with a big enough horde. They respawn and you will take huge casualties, but it's very satisfying.
 * Actually, spider-hunting can be a very effective way of gaining food on a map where your colony's developed (and crammed with soldiers, of course) and the food supply has dwindled for one reason or another.
 * On the original PC version, in this troper's opinion, the sound effects are MUCH freakier than the SNES version. Events (such as having a follower emergency-feed you) jump out of nowhere with unsettling visuals and sounds, leading to many an unintentional Jump Scare.
 * This troper had nightmares for years. A sudden, flash-stepping spider appearing out of nowhere and eating you, accompanied with a close up of its face. Even positive things like getting fed are accompanied by Nightmare Fuel.