porch or BMW ?

[blue]

A bum comes up to the front door of a very expensive house and raps gently on the door. When the rich owner answers, the bum asks him, "Please, sir, could you give me something to eat? I haven't had a good meal in several days."

The owner says, "I have made a fortune in my lifetime by supplying goods for people. I've never given anything away for nothing. However, if you go around the back, you will see a gallon of paint and a clean paint brush. If you will paint my porch, I will give you a good meal."

So the bum goes around back and a while later he again knocks on the door. The owner says, "Finished already? Good. Come on in. Sit down. The cook will bring your meal right in."

The bum says, "Thank you very much. But there's something that I think you should know. It's not a porch you got there. It's a BMW."