This page does not exist. This page has never existed. This page will never exist. This page shall never exist. This page shall never have existed. This page will not exist even after you have read it.
Also related:
You do not exist. You have never existed. You will never exist. You shall never exist. You shall never have existed. You will not exist even after this page has met you.
Not as closely related, but following a similar theme nonetheless:
i do not exist. i have never existed. i will never exist. i shall never exist. i will never have existed. i will not exist even after i have died.
And now, the twist:
This computer does exist. This computer has always existed. This computer will always exist. This computer shall always exist. This computer shall always have existed. This computer will exist even after it has ceased existing. This computer will exist even after you have crashed.
WARNING!
- If you are reading this page, you do not exist.
- If i am showing you this page, we do not exist.
- If this computer is displaying this page, then it has ceased to exist.
The team at
Sara Tonen.
FACT: This page has successfully caused 
people to cease to exist.
Link - Use this link to reaffirm your existence in the dead zone.