What will happen when all the possible answers are given to all possible questions?
We'll all hold our monitors upside-down and shake them so we can start over.
We'll get very good at clicking "vote to close as duplicate".
Jon Skeet will put some ice on his wrists. That was a lot of typing.
That will never happen.
But, when it does, there will be balloons. And cake. And maybe champagne, if we can get Jeff to spring for it. Otherwise, it's BYOB - I recommend something light, the cake will be too sweet (it's always too sweet).
We'll never know because the SO search is so bad the duplicates will never be found.
Fire and brimstone coming down from the sky! Rivers and seas boiling!
Forty years of darkness! Earthquakes, volcanoes...
The dead rising from the grave!
Human sacrifice. Dogs and cats living together. Mass hysteria!
At that point the universe throws a Stack Overflow exception, and Jon Skeet's reputation is set to zero.
We will finally know the Ultimate Question that goes along with the Ultimate Answer.
The shear mass of questions will collapse in upon themselves, forming a black hole which will envelop our entire existence. Once everything has collapsed to a singularity, a big bang will occur, and it will all start over again.
Either that or a rain drop will fall in the Sahara.
One can never calculate the outcome with 100% certainty, you know.
We will beat entropy