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Nightmare Fuel: The Core
The scene where they show the cabinet members exactly how the planet is going to get cooked by cosmic rays. Yikes.
The destruction of the Golden Gate Bridge, as a tiny hole in the earth's layer caused one man's arm to instantly sunburn from being outside a car window. And then the bridge collapses in a way not unlike the Tacoma Narrows Bridge.
The lightning-storm that destroys Rome monuments and even statically charges coffee machines enough to cause a shock from touching them. Seeing such monuments the Colosseum explode without crumbling is very creepy.