what is it?

you leave
the house and try
to think
what you might
be leaving
behind.
you don't want
to get out on
the road
and have to turn
around and come
back.
what is it?
your book, your
phone,
money. you tap
at your pockets
for anything,
but nothing
comes to mind,
not even the hot
cup of
coffee that sits
upon your roof.