Before the dinosaurs are given Brain Grain cereal, they can look quite frightening to young children. They are much more realistic and menacing looking.
Professor Screweyes and his circus can be very frightening to children. The entire purpose of the circus is to frighten people, with demon-like creatures carrying pitchforks, skulls, gothic-looking people and so on (though it's all just people in costumes). Prof. Screweyes also literally has a screw that has replaced his left eye, which he uses to put people under trances.
Professor Screweyes' fright radio is quite creepy, even to older audience members. Soul-like children apparitions pour out of the radio as they wail what scares them most.
U: very mild peril, innuendo, scary images.