Nightmare Fuel / Shack Tactical

• The Caesar Merlin missions, where a handful soldiers must evade capture in enemy territory, in a heavy rainstorm, in the middle of a moonless night, while an entire platoon of Russians is hot on their trail. Dslyecxi's original Caesar Merlin mission captures the atmosphere very well.
  • CHKilroy has Vozvrashcheniye, which perfectly punctuates that feeling of a ring of enemies closing in on you.
• Every single Zombie-themed mission, and particularly S.H.A.C.K.E.R, will usually be this. But it gets even worse when Dslyecxi decides to start playing mind games, as in Taconic's The Dslyecxi Monster.
• Dslyecxi's whispering.
  • In an early Cinematic video called Nomads, ChrisJSY leads a small team of American commandos to carry out surprise attacks on two enemy facilities, under the cover of total darkness. Meanwhile, Dslyecxi is filming their actions from close up, using his disembodied observer cam (and without their knowledge). After taking the second objective in a costly firefight and destroying a Scud missile launcher, the unit spreads out to defend the captured facility while they await further orders. Then this conversation happens:
    ChrisJSY: What do you think would've been better to assault this place from? And don't say "Don't do it at all".
    Soldier 1: That's hard to say, because there were patrols along the whole perimeter, it seems, so...
    Soldier 2: We would've been fine if that first patrol didn't find us.
    [...]
    Soldier 3: It was our failure, no one was watching the back.
    Dslyecxi: [Whispering] I was.
    * Queue pants-shitting terror*
    ^note The whispering continues for several more minutes...
• Beagle's use of an incendiary grenade in "Zombies of Zargabad" is so traumatizing that the teammate he was trying to rescue chooses to fall into the flames, and Beagle himself spends the rest of the mission as a Death Seeker. Because good lord, the screaming...
• In Hellscort, despite Dslyecxi's frantic attempts to escort Kilo squad to safety, (at certain points he sounds dangerously close to a Heroic BSoD) Kilo gets wiped out by the enemy. Regardless Dslyecxi lands his helicopter nearby and climbs into the back of the truck, hoping against hope that somebody is still alive and can be helped. Nobody is. And although the view of all the slaughtered soldiers slumped over in the back of the truck◊ only lasts for a second or two, it's quite long enough to break the hearts of everyone who had been on the edge of their seat hoping for Kilo's survival, and to haunt their nightmares.