In Markus Zusak's The Book Thief, the protagonist, Liesel, has dark brown eyes, and this is dangerous in Nazi Germany. The Nazis are looking to develop a “master race” of people with blonde hair and blue eyes who look alike. Those who don't conform in appearance, like Liesel, are at risk of eventually being eliminated.

Of course, Liesel is dangerous to the Nazis and their regime for more reasons than just her eyes. Liesel is curious, interested, and engaged with her world. She wants to learn, study, and think, and people who do these things are not as easily influenced or controlled by propaganda. Liesel is also willing to stand up for her beliefs. She fights against bullies, steals books from Nazi book burnings, and even helps her foster parents with hiding a Jewish man in their basement.

Furthermore, Liesel descends from “dangerous” parents. Even before the story starts, Liesel's father has been arrested and taken away as a communist, and her mother is suspect as a communist's wife. This is why Liesel goes to live with foster parents, Hans and Rosa Hubermann, where she will be safer. But Liesel is an independent spirit, and she resists the Nazis in her own small ways, proving that she is indeed dangerous because they cannot control her.