- Batari's death. After a long a difficult boss fight, Takkar holds her against the fire that her and the Izila worship. As a result, she slowly roasts to death over the fire that her cult worshipped. And you are made to watch it all in gruesome detail.
- Whenever your tamed beast is running towards you at night. Even though you know they're not running to attack you, it's still pretty jarring to see a gigantic cave bear with glowing eyes running at you.
- Takkar himself could be considered this. The Udam have been waging this war and winning for a long time, when this one Wenja softblood arrives. No big deal, just another hunk of flesh to eat. But then what happens? He reclaims the best and brightest of his tribe, and gives them a home to live in. You go there to offer your objections through the use of clubs and poison. Then he comes with beasts. The animals that can destroy an entire hunting party obey his commands. His weapons become more and more complex and polished and his tactics more and more intricate. Then he assaults your fort, then your homeland, alone and completely slaughters anyone he finds there. Though his own skill and tenacity, Takkar has single-handedly doomed whatever little hope your tribe had left. Taken even further if you clear the Outposts while remaining undetected. Do that consistently and Takkar has essentially become a force of nature. Your tribe in these outposts are all dying over the course of one afternoon... and you don't even know why.
Nightmare Fuel / Far Cry Primal