A series about a charming little duck? How could this be filled with Nightmare Fuel? Well, first of all, though aimed at children "Alfred J. Kwak" had a lot of themes and hidden allusions to the adult world like Nazism, colonialism, epidemics, republicanism, Apartheid, doping,... When you're a kid all that stuff just goes over your head, but at the same time it can disturb you.
* The opening sequence always featured a strange BigLippedAlligatorMoment, where Alfred is travelling by elephant. Suddenly he is lifted from the carriage by a huge black claw. In a brief flash moment you see a horrible skeletonlike creature who zaps him away! The worst part? It happened every time in the opening sequence, though the creature itself was never shown, nor explained in ANY of the episodes!
* The very first episode is already traumatic. Alfred's parents and baby brothers and sisters are all killed by a speeding car. The vehicle arrives, they look up to see the flash lights and then- wham!- they're simply gone. Alfred managed to survive because he remained behind.
* Alfred and Dolph trapped inside a well somewhere in a lonely snowy landscape. To make matters worse a large cat discovers them and tries to get to them below...
** While they are in the well Dolph taunts Alfred for being raised by a mole. He says that in the Middle Ages they would banish him out of town. Alfred's imagination then runs wild. He envisions himself in a medieval court with his personal teacher (with a truly awful NightmareFace) sentencing him to be banned. The dream sequence goes further with Alfred being yelled at by the townsfolk and then literally thrown out behind the city walls. And there he stands, alone, with no friends at all.
* Alfred has a very vivid and gruesome subconscious in general: in episode 9, he dreams of Henk coldly and silently locking him out of the house due to his size, leaving him falling through the sky without anything to hold on to. In a later episode, reading about another country's drought in the newspaper causes him to dream of being trapped there, scorched by the desert, slowly dying of thirst, and surrounded by ragged, hollow-eyed, cynical natives who make fun of his plight. Then a celebrity arrives with donations - which turn out to be ''milk powder and winter coats''.
* Alfred and his class visiting the Royal Castle for a school trip. One of Alfred's friends is a magpie and thus steals the crown. Alfred is held suspect and then thrown inside jail, where he spents a night alone in the castle. The worst part is that his adoptive father, Henk, isn't informed about this and worries himself all that time.
* There was an episode where Alfred and the children in his school attend a sporting event. Dolph gives one of the kids some medicins to make him stronger. Unfortunately he doesn't know that this medicine is actually made for elephants. The kid beats Alfred in the final race, but as they are waiting to receive their gold medals he doesn't feel so well. Suddenly the side effects kick in! The kid's body swells up and his nose starts to grow like an elephant's trunk. This seriously creeped this troper out when he was small.
* Alfred travelling to a country where black ducks are oppressed by white ducks. Disturbing when you're a kid, especially disturbing when you get older and realize this is a reference to South Africa's apartheid policy, which at the time this series aired (1989), was still in effect.
* Alfred going to the circus where he is confronted with a wild and dangerous beast. What kind of animal could be so dangerous in this animal universe that it needs to be locked away, you might ask? Well, its name is "The Human"! Some mind boggling PostModernism!
* Dolf taking over the country in a Nazi like dictatorship, causing Alfred and his friends to flee to a neighbouring country.
* The Mozons virus acts like a perfectly ordinary flu ... until it causes you to age several decades in the course of several days.