Just noticed that Siemens bought the entire background at The Huffington Post. A click anywhere in the blue (outside the bounds of the content section I’ve faded to black below) will take you to a Siemens landing page.
So they aren’t just buying the background display, they are buying any clicks outside the content area. I wonder how many accidental clicks they’re getting and how much THP is charging for a full background buy. And I wonder who pitched the idea — the publisher or the advertiser. Have you ever seen this on another site before?