I was reading Youngest Billionaires of 2013 from Forbes Magazine, but surprised by seeing that they are using strange types of adsense unit in their posts. At first I thought that its done by adsense API, later I found that they did a iframe job to show Search Result Ad!
Here is the screenshot:
Also, they show only adsense ads for few seconds for the first time you visit that website, this maybe sometime force the visitors to click those ads. Can any publisher do the same? isn't it breaking adsense terms?
Maybe I am wrong, what you are thinking? Is any publisher can do the same?