- Idate's brutal beatdown and consumption of Samekichi.
- The very nature of Sketchbook's powers as she exposed the inner fears of others and exploited them. Thankfully locked.
- The trauma Bilbo Baggins went through every time someone wanted to ride the dragon.
- The PTSD effect any sort of solar eclipse appeared to have on the citizens.
- Mercer's use of his abilities to mentally terrify and traumatize the Once-ler.
- Walter Sullivan's treatment of Henry Townshend, as well as his Otherworlds.
- Ken Amada's Shadow. Just... holy shit. 
- The 2017 Halloween mini-event? Everyone's worst fears coming to life and able to harm other people, of course!
Nightmare Fuel / Citta Alveare