- The episode "Who's The Mightiest Squid Of All". Squid Girl made several Nightmare Faces in that episode when she plots to kill them when she hears about food made of squid. Geez.
- Also, whenever Chizuru opens her eyes.
- Chapter 113 has a mild case as the end twist, especially if you love cats: the cat turns out to be a robot, and can transform into a very weird form.
Nightmare Fuel / Squid Girl