Homeless man holding a sign sounds like a professional voice actor.

The golden voice of a homeless man. The yuppies love it.

Read more:

http://www.sfgate.com/cgi-bin/blogs/hottopics/detail?entry_id=80397

http://www2.nbc4i.com/news/2011/jan/04/8/homeless-man-golden-voice-will-have-his-day-radio-ar-350184/

He was even offered a job!

http://www.newsnet5.com/dpp/news/local_news/cleveland_metro/cavs-offer-homeless-man-with-golden-voice-a-job-and-a-house