Stolen from the internet but it made me laugh:

A guy wanting to earn some money decided to hire himself out as a handyman-type and started canvassing a wealthy neighborhood. He went to the front door of the first house and asked the owner if he had any jobs that needed to be done.

"Well, you can paint my porch. How much will you charge?"

The handyman said, "How about 50 dollars?" The homeowner agreed and said that the paint and ladders that he might need were in the garage. The homeowner's wife, inside the house, heard the conversation and said to her husband, "Does he realize that the porch goes all the way around the house?"
The man replied, "He should. He was standing on the porch."

A short time later, the handyman came to the door to collect the money.
"You're finished already?" the homeowner asked. "Yes, and I had paint left over, so I gave it two coats."

Impressed, the man reached in his pocket for the $50. "And by the way," the handyman added, "that's not a Porch, it's a Ferrari."