A homeless man knocks on a woman's door, looking for help.
"Think you could spare a few bucks? maybe some food?"
The woman thinks to herself for a few seconds, then says, "You could do some handy work around here, I'd be glad to give you $30 if you paint my porch. There's some green paint and a brush right around the corner there, have at it."
He thanks her, and heads towards the bucket. She returns inside and resumes her knitting.
After about an hour, she gets up to check on his progress, and sees no man, or a freshly painted porch. Just then, she hears a knocking again at her door, and goes to open it.
She is greeted by the same man, green paint splattered on his clothes and in his beard, a wide grin on his face.
"All done ma'am. and by the way, it's a Cadillac, not a Porsche."