Donkey Kong Country Returns/Nightmare Fuel


 * One of the forest levels has an Advancing Wall of Doom... made of SPIDERS! Even worse, they're baby spiders that come from you smashing open egg sacks. And if you fall a little too far behind they'll drag Donkey or Diddy down into their depths, complete with look of utter terror on the poor apes' faces.
 * The aptly named "Tidal Terror". Nothing like big rogue waves coming right at the screen.