"I was awake half the night thinking it all over, and I believe its a plot to get the house. The house? repeated Harry. What house? This house! shrieked Uncle Vernon, the vein in his forehead starting to pulse. Our house! House prices are skyrocketing around here! You want us out of the way and then you're going to do a bit of hocus-pocus and before we know it the deeds will be in your name and Are you out of your mind? demanded Harry. A plot to get this house? Are you actually as stupid as you look?"
Book: Harry Potter And The Deathly Hallows Unfortunately for Vernon, yes, he probably is as stupid as he looks. It's amazing how baffling some people can be and Harry's unintentionally angry response is rather amusing.