I’ll paint your porch for twenty bucks

A blonde comes up to the front door of a neat looking farmhouse and knocks gently on the door. When the farm owner answers, the blonde tells him, “Please, sir, I will do anything for money.  Is there something you would like for me to do for you?”

The owner says, “Well, 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 twenty dollars.”

So the blonde goes around back and a while later she again knocks on the door. The owner says, “Finished already? Good. Come on in and I’ll get your twenty dollars for you”

The blonde says, “Thank you very much, sir. But there’s something that I think you should know. It’s not a Porsche you got back there. It’s a BMW.”