I should build one of these... then just put it in the mall for an hour. How would you like to hear good old Microsoft SAM saying things like "I just need to feed my family" or better yet "I need to pay my electric bill."
FYI Microsoft SAM happens to be the voice that Stephen Hawkins uses on his little DOS based computer.
Anyway... just some food for thought.
P.S. I think the best thing would build one that has a solar panel on top, and says that it can't draw enough power form the sun to run himself...