If you throw me out of the window I'll leave a grieving wife

Question: If you throw me out of the window,
I'll leave a grieving wife.
Bring me back, but through a door,
You'll see someone giving life.

What am I?

Question: Why did the hen cross the road?

Question: What do you call a sad bird?

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Question: What is the tallest building in the world?

Question: What tastes better than it smells?