my favorite is "Homeless... oh f*** it I wont lie to you I'm just lazy"
but that might not go down too well
"Will work for booze"
"I aint crazy, but the three headed man told me to live here"
"Fallen on hard times, please spare some change"
"Homeless"
I have run out of ideas... most homeless people in manchester dont bother with signs, and they are the only homeless people i really ever see