When you search at Google.com on certain keyword phrases, you may see the sponsored listings at the top of the page. Those listings have a blue background, so that they are clearly labeled as paid listings. But, did you know, if you click on the blue area, with no ad text, it will still take you to the advertisers landing page and charge the advertiser?
As you can see from the image above, I boxed out the blank area, that if you click within, you will be taken to the advertiser who is closest to your mouse click on the left.
ShandyKing at our forums says he sometimes clicks on a page to drag the page down. When he does this at Google, he some times accidently clicks on an ad, even though he is not clicking on any ad text.
Do you have ad "clumsiness" that costs advertisers dollars?
Forum discussion at Search Engine Roundtable Forums.