For example, a boy has a lot of body hair, coming to the conclusion he's a werewolf when he could just have some
type of condition, such as hormone imbalance. His mother never tells him of this, and feels asromgic when she sees her son gain a look of recognition on his face.
Or,
Naruto (yes, Uzumaki ;)) hears the villagers call him Kyuubi
brat, demon, and avoid him
like the plague while he's followed by Anbu and checked up on by the Hokage, coming to the conclusion that he IS the Kyuubi. The villagers hate him for killing
people, the Anbu follow him and the Hokage check up on him to make sure he doesn't again. (From inside the Shimigami's stomach, Minato is feeling Asromgic)