If I believed in that sort of thing, I would guess that it said "leave Alphabet City immediately."
The explanation:
The aftermath:
tabo: is that the erlang book?
dan: yes it is
dan: good eye
dan: it has pigeon shit on it now
The Portable Atheist (that yellow book) and a few of my pint glasses appear to have also offended some vengeful, jealous god of pigeons.