We know warning;
On the fields of Trenzalore,
at the fall of the eleventh,
when no living creature can
speak falsely or fail to answer,
a Question will be asked.
A question that must never, ever be answered.
It was spoken by Dorium Maldovar before he became a Headless Monk.
There is another saying. It goes like this;
… on second thought, lets not go to
’tis a silly place
That, if you want, can be yours on a wise t-shirt.
Do you want it? I want that t-shirt.