Nightmare Fuel / Ponyo on the Cliff by the Sea

• Those dark-water-blob-things Fujimoto sends to get Ponyo back from Sosuke. They practically submerge him, and those eyes. The sounds they make are also quite creepy.
• When Fujimoto takes Ponyo away from Sosuke early in the movie, Sosuke wades into the ocean, frantically calling her name. The scene quickly turns the parental worries dial up to maximum, as he wades so deep that he's in real danger of getting swept away and drowning. Indeed, his head goes under the water at least a couple times. When his mother sees him, it's her turn to frantically call his name as she tears down the steps and rushes in to grab him. One can only imagine what was going through her head at that moment. For instance, what if she hadn't found him so quickly?
• When Ponyo returns to Sousuke, she causes a massive flood. While, thanks to her mother, nobody was hurt, it's still a nightmarish display.
• Ponyo's sudden shifts from human to half goldfish form sometimes. Especially in the case where she tries to cheer up a baby by getting a little too up close and personal.
• Ponyo's father, Fujimoto, can be this at times. Especially some of his facial expressions.
• Lisa's driving can be a bit nerve wracking. Specifically when she's trying to out-drive the incoming waves and rain.
• The fact that Fujimoto plans to eventually flood the earth with an explosion of sea life to put an end to the age of humanity. This is mentioned a grand total of once in the movie, and never mentioned again after Ponyo floods his elixirs. However, given that his daughter now lives on land (and he seems to respect her choice) he probably won't go through with it. Doesn't make what he was going to do any less scary, though. Ponyo may have indirectly saved humanity...
  • It's not clear that he intended to actually wipe out humanity. He calls the current age the Era of Man, and yet the ocean isn't dead. So bringing about the Era of the Ocean and ending the Era of Man doesn't imply that humanity has to die.
• The scene where Ponyo tells her father she wants to go back to Sousuke. He responds by squeezing the bubble until she is unconscious to try and keep her safe. Her sisters look a bit freaked out themselves.
• Fujimoto's minions. They're very unsettling with the distorted mumbling and the freaky eyes. And the fact that they rush and submerge a five-year-old doesn't help.
• Ponyo's chicken leg transformation.
• There's something unsettling about the scene where Sousuke finds his mom's abandoned car. While the rest of the film was very fantastic and whimsical, (just moments before you had a five-year-old and his best-fish-friend sailing an enlarged, candle-powered toy boat) all of a sudden Sousuke seems genuinely frightened and vulnerable, just like a real kid. The suddenness and realism of this scene, with Sousuke tearfully crying for his mom, is oddly disturbing, tapping into the fear of a kid being alone and a parent knowing their kid is alone. It's made worse moments later when Ponyo starts to change back into a fish.