Nightmare Fuel / Syphon Filter

• Although frying enemies with the taser is fun, their screams are pretty nightmare fuelish and might make you feel guilty, specially the ones in SF2 and SF3. And there's something really wrong in tasing Lian or any friend of Gabe to flames...
• Any level that takes place after an explosion are sure to have at least one or two enemies simply coming out of the darkness screaming while in flames and scaring the crap out of the player. It doesn't help that the player can burn to death if they let these guys touch them.
• Despite "Missile Silo" not explicitly telling you about time limit, Gabe Logan needs to get the self destruction code for the missile under a tight time limit. If the player starts to hear the robotic voice of countdown in Russian language, that means Gabe has a narrow ten seconds to obtain the self-destruction code before the missile launches. Fail on this and it's an instant 'Mission Failed' (the missile containing viral weapons being launches, causing gigantic death off screen and possibly triggering World War 3).
• The helicopter boss fight at the base's tower, due to the fact the helicopter uses the darkness of the night to hide, flying away and then coming back while unleashing a raging burst of fire from its machine gun at Gabe, that could kill him in seconds. Most of the time it shows up, you'll be panicking to take cover behind something before it manages to get you. Worst of all? You can never predict the helicopter's movements. Sometimes there's a large gap of time between his previous attack and the other, which often results in you getting jumpscared as you go for ammo, only for the thing to slowly pop up right in front of you and blast you to swiss cheese.
• The Syphon Filter virus itself.
  • While it has the potential to cure cancer, Markinson spells out how dangerous it is;
    Markinson: A virus genetically programmable to eliminate anyone or anything. Imagine a weapon that could target specific demographics, ethnic groups... it could wipe out whole continents, except for those chosen to survive.
  • The viral weapon was so lethal, even CBDC agents wearing hazmat suits and gas masks were not immune against its effect.
  • Obviously many terrorist leaders and conspirators who wanted to buy the virus from Pharcom paid no attention about curing cancer.
  • While used as viral weapon, Syphon Filter (according to an in-game researcher) was stated that the virus behaved similarly to Mad Cow Disease and HIV.
• Lian Xing went through majority of the second game being infected with a seemingly incurable disease she carried from the first game. She was heard coughing several times. One level required her stealing an energy booster from an airbase health facility to prevent her from losing consciousness before finishing her missions. Eventually she passed out after rescuing an old friend and an important military figure from Aljir Prison.
• Anton Girdeux's pained screams as he burns to death in his own bulletproof suit, all while Gabe does an Unflinching Walk away from him. It's so horrible to listen to that it makes Gabe look like a complete sociopath in the cutscene. Worse yet? In Syphon Filter 2, you get to see what remained of Girdeux's body in all of its charred glory.
• The amount of times Gabe has killed unarmed scientists (who are non-combatants and, thus, it is considered a war crime to kill them) in the original trilogy reaches a worrying point.
  • It's specially gruesome in the last level of the first Syphon Filter, where he needs to kill two scientists who actively run away from him in order to get a keycard to progress.
  • In Syphon Filter 2, you have the opportunity to stab a scientist, who is compliantly surrendering to you, with your knife when you're escaping the bio lab, complete with Logan letting out a Pre-Mortem One-Liner. He really is a bit of a psychopath, which makes the HECU's treatment of the (technically civilian) Black Mesa personnel humane by comparison.
  • Mind you, the former scientists are trying to start World War III and the latter is a bioweapons' developer, so you could hardly blame Gabe.
• ALJIR PRISON, which is based on real place. While the game potrayal of Aljir Prison is horrifying, take notice that this is still a 'toned-down version' of its real life counterpart that used to be active in Cold War era.
• Gabriel Logan's covert mission in Afghanistan when he was still in U.S. Army with Ellis definitely counts as well.
• In 2, Gabriel Logan and Chance were ambushed by Spook field operatives in a tunnel, all of them wearing flak jacket. What did Gabe do? He used flamethrower from nearby APC to burn those Spook operatives to crisps. To put it into words, their agonizing screams were unsettling.
• The land mine in Costa Rican Plantation level from 3 can be unsettling for those who are skipping through 1 and 2 and still new to this game, since no enemy used grenade or any kind of explosives until this point.