This is based on opinions, and therefore has a different answer for everyone. But, a scary thing that will happen in 6 billion years: the sun will explode.
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A global nuclear war resulting in widespread destruction and loss of life would be one of the scariest scenarios that could happen in the world. It would have devastating consequences for humanity and the planet as a whole.
The Tower of Terror at Disney's Hollywood Studios in Florida is often considered one of the scariest rides in the world. Riders experience sudden drops from a great height and intense special effects that simulate a haunted elevator experience.
In 2012 the solar system will be exactly the same. Because 2012 is just another year there's no such thing as the end of the world
Tornadoes cannot destroy an entire world. They are large rotating columns of air extending from a thunderstorm to the ground, typically causing damage along a narrow path. Tornadoes are destructive on a local scale, not on a global scale.
they mostly happen near the atlantic
Anywhere in the world.