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Nightmare Fuel: VeggieTales
In Larry-Boy! And the Fib from Outer Space!, Junior's lies about breaking a plate end up getting him captured by a giant monster who proceeds to attack the city and destroy cars and buildings. Said monster also threatens to eat Junior and actually does try to eat Larry-Boy.
Larry-Boy! And the Rumor Weed! has a scene where Larry-Boy is in the Mother Weed's lair, without any way to contact Alfred. And then the Mother Weed shows up.
King George and the Ducky: King George sends Thomas to the Pie War over a rubber duck, causing Thomas to go insane. Even with knowing they're Animated Actors, seeing Larry of all people do something so awful and callous is unsettling, and Thomas being played by Junior pushes the whole thing uncomfortably into Child Soldiers territory.
Even worse if you know what happened in the story this short was based on.
Even though it's a Bowdlerisation, in Esther: The Girl Who Became Queen, the grim tickler that shows up to bring people to the Island of Perpetual Tickling is pretty disturbing, what with his way of appearing seemingly out of nowhere and the scary organ music playing in the background.
Worse still, eventhough it is seconds before he is redeemed after the boys are saved, Mr. Nezzer practically borders on the Moral Event Horizon after witnessing their plunge into the furnace with an Evil Laugh and some Evil Gloating to go with it. Contributing to the entry above on what would happen if Rack, Shack, and Benny didn't get saved from the flames, just imagine what kind of person Mr. Nezzer would have become after that. Definitely NOT the kind of boss you'd want to work for.
The Bad Apple from Larry-Boy and the Bad Apple has spider legs for a bottom half, and is generally creepy.
The Slap of No Return from Jonah A Veggie Tales Movie. Basically it's a giant club on a lever that smashes its victims like a bug. That they actually give a demonstration of how it works (with a thankfully non-sentient pumpkin) just made it even more disturbing.