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.
YMMV: The Darkest Hour
Fridge Logic: If the aliens are after conductive metals, why aren't they touching the various metal objects around? Lampposts, downed airplanes, cars, etc. The entire city is untouched except where the aliens are drilling for metal.