Those fits the Chief Blue Meanie went into when stressed.
The Dreadful Flying Glove. Most of the other meanies are that wacky, crazy type of evil, but the Glove is just pure, unfettered evil.
Especially with that deep, terrifying laugh of his. Brrr...
The Sea of Monsters, with all the multicolored, smiling creatures and strange noises were just so unsettling.
The "Sea of Time" is sort of creepy for those afraid of mortality and aging.
The weird maths equations, soundwave diagrams (the only live-action effects within the movie itself), and Andy Warhol-esque portraits of the Beatles floating in the Sea of Science, along with George's creepy, passive-aggressive "Only A Northern Song", make for one of the most inexplicably disturbing moments in the film.
Jeremy. In his entirety. Every single moment. Always.