Futurama/Nightmare Fuel

Welcome to the future, at least as seen through Futurama. Please be warned spoilers abound. Which makes sense, as this is the future.

"Amy: Hello? Did you see two smelly lobsters?
 * The episode where Fry is sent to an asylum for mad robots and "cured" to think he is a robot, compounded by Fry's disheveled, gray appearance while he's in the asylum. And the sad fact that nobody tried to save him, not even the Planet Express crew, was deeply unsettling. Although the episode made up for it with Bender claiming to be Napoleon.
 * The ending to A Fishful of Dollars where Zoidberg demands more anchovies, which went extinct in the 2200's, after he eats all of them from the can Fry won in an auction (long story) on a pizza.
 * "The Sting" may make you cringe forevermore at the sight of furry bumblebee bodies. Fry's death, Leela's hallucinations, followed by her descending into madness, her attempting suicide just so she can be with Fry, and Leela getting attacked by bees after she throws the honey against the wall. The only consoling thing is that none of this happened, Fry was alive, and that the whole thing was Leela's coma fantasy.
 * The space bees themselves. It's telling how dangerous they are when Professor Farnsworth, who's perfectly fine sending his crew on suicide missions, demands they not go.
 * The scenes with the space bees are a lot worse if you're apiphobic.
 * In the episode, "The Late Phillip J. Fry," Fry, Bender and the Professor accidentally go forward in time 1000 years in a time machine... that can only go forwards in time. They decide the best course of action is to keep going forward until they find a time period that has invented a time machine that can go backwards, but end up going so far forward that they see The End of the World as We Know It. They decide just to keep going to see what will happen, and end up witnessing the literal destruction of the universe. The animation for this section is awe-inspiring, but it is also utterly terrifying. Especially since they had no way of knowing that there was a Stable Time Loop and eventually they would return to their time "the long way around". For all they knew they would've just sat there trapped in that time machine until Fry and the Professor starved to death and Bender ran out of fuel.
 * In Teenage Mutant Leela's Hurdles, the crew all begin to age backwards and get younger and younger as time progresses. By the end of the episode, they're simply fetuses, and would suffer a Fate Worse Than Death... pre-life! Then death. They find a fountain of aging to get them back to their right ages, but Zoidberg unfortunately slips in, and he ages at such a rapid pace that he is dead by the time he reaches the center. Luckily, Turns out it wasn't Zoidberg, though. It was just one of his brothers that budded off, while there are miniature Zoidberg heads on the... coral... thing that they're all attached to. Seeing them all bicker does lighten the mood a little.
 * Seeing how Yandere the ship becomes to Bender, in Love and Rocket.
 * Yivo. Shklee has sex with the universe. So this means everybody in the Futurama universe (at least the women) might just be pregnant with an Eldritch Abomination. Heck, in this universe, maybe not even just the women. Or worse than that. Remember when Yivo said that shklee had gonorrhea? That means everyone in the world is infected with an STD! And on top of that, with all the diseases many people may have had, and Yivo's lack of immunity to them, shkler days are numbered...
 * Bone Vampires. They don't suck out their victim's blood. They suck out their skeletons.
 * In "Ghost In The Machines", Benders tries to scare Fry to death by creating an image of Fry's face melting. This nearly does the trick.
 * How the eyePhone gets installed.
 * That Guy's death from Boneitis. Watching Thiss body twist and curl upon itself like that is pretty scary to watch. Especially at the end when he finally dies.
 * In The Farnsworth Parabox, the characters run through several universes, including one in which everyone lacks eyes. It wouldn't be scary without the following dialogue:

Alternate Hermes: We didn't see anything. Ever."