Why did the Earth suddenly enter a manic episode then go back to a depressive episode?

Because it's bipolar.

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Earth Jokes More Earth Jokes

What's the fastest land animal on earth?

An Ethiopian chicken

What did the aliens say, when they came to earth in search of soda pop?

Take me to your liter!

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Why did Pavlov ring a bell every time a breeze entered his room?

Air Conditioning

How does one enter a brothel in Westeros?

Through the Hodor