Perhaps they're scared because they think a UFO is hovering above and they don't know what's going to happen next.
Well, it could be that they faced a scary monster or had a bad dream. Sometimes, just being in a new and unknown place can make them scared too.
Maybe they wandered into a spooky place by accident and came across the ghost.
Maybe they got lost or heard some strange noises that scared them.
Maybe they encountered something really scary or dangerous in the story.
Perhaps they believe that whatever is scaring them is coming from the sky. Or it could be a way for the cartoon creator to show their sense of wonder and fear in a visually interesting way.
Maybe it's because they make people feel sympathetic and curious. Their fear adds a layer of depth to the story.
Maybe the doctor is facing a very serious and unknown disease that scares him.
It could be that she heard a strange noise or saw a creepy shadow. Or perhaps she's in a spooky place and her imagination is running wild.
Maybe it's because their imaginations are too vivid and they think too much about scary stuff before going to bed.
The expression of a scared boy cartoon looking up typically includes a frightened gaze, maybe a hunched back, and hands grasping tightly. This indicates he's nervous about what he sees in the upward direction.