These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: remember the Sonicdrowning music? Imagine a mode called Chicken Race, where you're on a long straight road, your kart goes forward by itself, and the only action you're allowed to do is a single chance to break, as close as possible to the nearest pool of water. Good. Now imagine a fitting kind of BGM...et voilą.