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Nightmare Fuel: 2 Stupid Dogs
The Super Secret Secret Squirrel episode "Greg," in which the titular evil gingerbread man steals vast amounts of candy to create an enormous gingerbread man of his own. In the end, ants eat Greg's creation. And then they eat Greg. Alive.
"Inside Out" After Little Dog bites the electric ball from the museum and gets shocked we are treated to a very freaky scene of a flashing background with electric lines coming down behind it, and a very scary tiki-god like head staring at the viewer saying in a high-pitched voice "Foolish canine I am not your friend." and laughs evilly. Then it goes back to normal like nothing happens for a big-lipped alligator moment that was freaky!