Oh Crap/Tabletop Games/Choose Your Own Adventure


 * In the Fighting Fantasy book The Warlock of Firetop Mountain, the eponymous Final Boss will have one if you use against him.
 * While many of Lone Wolf's enemies give an Oh Crap reaction when Lone Wolf inevitably derails their schemes, the Darklords you face in Book 12 are great examples. After spending the entire series struggling to stop their forces from destroying everything, seeing these ancient incarnations of evil voiding themselves in fear when they realize Lone Wolf can actually kill them is extremely satisfying. The best one out of all of them is Archlord Gnaag's expression of "panic blazing madly in his eyes".
 * Big Bad Ixiataaga in Book 17 has a similar reaction when he realizes Lone Wolf has a weapon that can kill him. His panic
 * Lone Wolf himself throughout the series reacts with fear every time he encounters the horrifying Crypt Spawn. It really doesn't help that they are a favorite summoned minion of the major villains. He also reacts badly to the Mech-Wulf in Book 20 -- the sight of an enemy devoid of any actual life or even un-life scares the hell out of him.
 * Lone Wolf himself throughout the series reacts with fear every time he encounters the horrifying Crypt Spawn. It really doesn't help that they are a favorite summoned minion of the major villains. He also reacts badly to the Mech-Wulf in Book 20 -- the sight of an enemy devoid of any actual life or even un-life scares the hell out of him.