It is a set of instructions of what to do if you find yourself inside a fairy tale, and it begins like this:
by Neil Gaiman
Touch the wooden gate in the wall you never
Say "please" before you open the latch,
walk down the path.
A red metal imp hangs from the green-painted
as a knocker,
do not touch it; it will bite your fingers.
Walk through the house. Take nothing. Eat
However, if any creature tells you that it hungers,
If it tells you that it is dirty,
If it cries to you that it hurts,
if you can,
ease its pain.
Here's video of Gaiman reading the full poem. He is, as I am fond of pointing out, an excellent reader as well as a terrific writer - and that is not always the case, as those of us who have attended a number of author readings all know, whether we usually say so or not: