A man is sitting on his couch one Sunday afternoon, trying to watch some football, when his wife starts nagging him to paint the porch. She tells him as she leaves to go grocery shopping, "If that porch isn't painted by the time I get home, you're in big trouble.
The man is bummed out, because he really wanted to watch the game. Just then, he gets a knock on the door. It's a hot blonde girl looking to make some extra money, and asking if there's anything he needs done around the house. Delighted by his stroke of luck, he asks her to paint his porch, and points her to the buckets of paint, and she agrees.
The man goes back to his couch and watches the football game, smiling at how everything was working out for him. About 20 minutes later, the girl knocks on the door again. She says "All done". The man, perplexed at how she could've finished a job that should've taken hours in 20 minutes, says "You're already done?". The girl replied, "Yes, and I had so much paint left over, I decided to give it a second coat. Oh, and by the way, it's not a porch, it's a Ferrari."