Scooby-Doo (animation)/Nightmare Fuel

• After watching Vampire Bats and Scaredy Cats (The Scooby-Doo Show), this troper, as a young child, had to sleep with a full head of garlic on her nightstand. For a month. Literally had nightmares about vampires coming to kill her.
• The Scooby Doo Project. It's a parody of The Blair Witch Project. That should show give you a good idea. What makes it worse is it's implied the gang died at the end
• Scooby-Doo on Zombie Island is horrific. It's full of Body Horror.